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DTSTART;TZID=America/Vancouver:20231123T100000
DTEND;TZID=America/Vancouver:20231123T110000
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CREATED:20231106T183834Z
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SUMMARY:CM Seminar: Jeff Sonier – Simon Fraser University: Muon Studies of Superconducting UTe2
DESCRIPTION:Jeff Sonier – Simon Fraser University\nTitle: Muon Studies of Superconducting UTe2 \nAbstract: Recently discovered UTe2 is believed to be a long-sought spin-triplet superconductor\, but its magnetic properties and superconducting order parameter are matters of controversy. The observation of a nonzero polar Kerr effect in the superconducting state of UTe2 single crystals exhibiting two phase transitions in the specific heat has been taken as evidence of a time-reversal symmetry (TRS) breaking order parameter and chiral superconductivity. Yet a more recent study of the polar Kerr effect in single crystals exhibiting a single-phase transition found no evidence for TRS breaking. Zero-field muon spin relaxation (SR) is an ideal tool for independently determining whether TRS symmetry is spontaneously broken at the superconducting transition temperature\, Tc\, but until recently it has not been possible to investigate this in UTe2 due to the presence of slowly fluctuating spins. I will first explain what SR has revealed about the magnetic interactions in UTe2\, which potentially play a role in the pairing mechanism that gives rise to spin-triplet superconductivity. I will then describe recent SR studies of a new generation of UTe2 single crystals\, which shed light on the role disorder plays in the magnetic fluctuations and have provided an opportunity to look into whether TRS is broken. \nSpeaker bio: Jeff Sonier is a Professor at Simon Fraser University.
URL:https://qmi.miffanytark.com/event/cm-seminar-jeff-sonier-simon-fraser-university-muon-studies-of-superconducting-ute2/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20231116T100000
DTEND;TZID=America/Vancouver:20231116T110000
DTSTAMP:20231006T212241Z
CREATED:20231006T212241Z
LAST-MODIFIED:20231006T212241Z
UID:6425-1700128800-1700132400@qmi.miffanytark.com
SUMMARY:CM Seminar: Xiaodong Xu – University of Washington: Observation of Fractional Quantum Anomalous Hall Effect
DESCRIPTION:Xiaodong Xu – University of Washington\nTitle: Observation of Fractional Quantum Anomalous Hall Effect \nAbstract: The interplay between spontaneous symmetry breaking and topology can result in exotic quantum states of matter. A celebrated example is the quantum anomalous Hall (QAH) state\, which exhibits an integer quantum Hall effect at zero magnetic field due to topologically nontrivial bands and intrinsic magnetism. In the presence of strong electron-electron interactions\, fractional-QAH (FQAH) states at zero magnetic field can emerge\, which is a lattice analog of fractional quantum Hall effect without Landau level formation. In this talk\, I will present experimental observation of FQAH states in twisted MoTe2 bilayer\, using combined magneto-optical and -transport measurements. In addition to the Chern number -1 integer\, and -2/3 and -3/5 fractional QAH states\, we find an anomalous Hall state near the filling factor -1/2\, whose behavior resembles that of the composite Fermi liquid in the half-filled lowest Landau level of a two-dimensional electron gas at high magnetic field. Direct observation of the FQAH and associated effects paves the way for researching charge fractionalization and anyonic statistics at zero magnetic field. \nSpeaker bio: Xiaodong Xu is a Boeing Distinguished Professor in the Department of Physics\, and Department of Materials Science and Engineering at the University of Washington. He obtained a PhD in Physics from the University of Michigan in 2008. After postdoc research at Cornell University\, he joined the University of Washington in 2010. He is a Fellow of American Physical Society and Optical Society of America.
URL:https://qmi.miffanytark.com/event/cm-seminar-xiaodong-xu-university-of-washington-observation-of-fractional-quantum-anomalous-hall-effect/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20231102T100000
DTEND;TZID=America/Vancouver:20231102T110000
DTSTAMP:20231019T171838Z
CREATED:20231019T171838Z
LAST-MODIFIED:20231019T171838Z
UID:6558-1698919200-1698922800@qmi.miffanytark.com
SUMMARY:CM Seminar: Joe Checkelsky– Massachusetts Institute of Technology: Natural Superlattice Design of Modulated Superconductors
DESCRIPTION:Joe Checkelsky– Massachusetts Institute of Technology\nTitle: Natural Superlattice Design of Modulated Superconductors \nAbstract: Connecting theoretical models for exotic quantum states to real materials is a key goal in quantum materials synthesis.  Two-dimensional model systems have been proposed to host a wide variety of exotic phases- historically a number of techniques have been used to realize these including thin film growth and mechanical exfoliation.  We describe here our recent progress in experimentally realizing 2D model systems using bulk crystal synthesis including modulated superconducting states.  We discuss their structures and the new phenomena that they support.  We comment on the perspective for realizing further 2D model systems in complex material structures and their connections to other methods for realizing 2D systems. \nSpeaker bio: Professor Checkelsky joined the Department of Physics at MIT as an assistant professor in January 2014. He received his B.S. in Physics in 2004 from Harvey Mudd College and Ph.D. in Physics in 2010 from Princeton University. Before coming to MIT\, Professor Checkelsky did postdoctoral work at Japan’s Institute for Physical and Chemical Research (RIKEN) and held the position of lecturer at the University of Tokyo. He was promoted to associate professor in 2019 and in 2020 named a Mitsui Career Development Professor in Contemporary Technology\, an appointment he will hold until 2023.
URL:https://qmi.miffanytark.com/event/cm-seminar-joe-checkelsky-massachusetts-institute-of-technology-natural-superlattice-design-of-modulated-superconductors/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20231026T100000
DTEND;TZID=America/Vancouver:20231026T110000
DTSTAMP:20231006T211631Z
CREATED:20231006T211631Z
LAST-MODIFIED:20231006T211631Z
UID:6423-1698314400-1698318000@qmi.miffanytark.com
SUMMARY:CM Seminar: Lindsay LeBlanc – University of Alberta: Light-matter interactions in cold and ultracold neutral atomic gases
DESCRIPTION:Lindsay LeBlanc – University of Alberta\nTitle: Light-matter interactions in cold and ultracold neutral atomic gases: Applications to quantum memory and holonomic quantum operations \nAbstract: Neutral atomic gases provide fantastic opportunities for studying and controlling quantum phenomena\, ranging from many-body physics to quantum computers. In our research\, we use the well-known interactions between cold gases and electromagnetic radiation to harness various quantum degrees of freedom. Quantum memories\, used for storing and manipulating photonic signals\, will be a key component in quantum communications systems\, especially in realizing critical quantum repeater infrastructure. Cold atoms have significant potential as high performance spin-wave quantum memories\, due to the long storage times associated with low temperature and slow thermal diffusion. In our work\, we demonstrate two memory protocols in ultracold (sometimes Bose-condensed) atoms\, which hold the potential for high-performance light storage: the Autler-Townes splitting (ATS) and superradiant approaches. These methods provide a path towards practical implementations in both ground- and satellite-based quantum communications systems\, and we are working on both increasing performance and developing practical implementations. In a separate direction\, our lab also uses ultracold ensembles to study unconventional quantum gates for quantum computing. In our work on holonomic operations\, we engineer degeneracies into our system through Floquet driving\, with the goal of realizing non-Abelian geometric phases. Our experiments reveal that we indeed rotate quantum states in this degenerate manifold\, though we find that the naive expectation of geometric robustness to fluctuations is less resilient to real experimental issues than expected. We fully characterize our system in terms of its performance in realistic conditions and propose a path forward for working with holonomic operations on a variety of quantum platforms. \nSpeaker bio: Lindsay LeBlanc is an experimental atomic physicist working with ultracold atoms and quantum technologies. Lindsay earned her BSc in Engineering Physics from the University of Alberta in 2003 and her Ph.D. in Physics from the University of Toronto in 2011\, after which she joined the Joint Quantum Institute in Maryland in 2013 as a postdoctoral fellow\, before returning to join the University of Alberta where she is Canada Research Chair in Ultracold Quantum Gases and Associate Professor in Physics.
URL:https://qmi.miffanytark.com/event/cm-seminar-lindsay-leblanc-university-of-alberta-light-matter-interactions-in-cold-and-ultracold-neutral-atomic-gases/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20231019T100000
DTEND;TZID=America/Vancouver:20231019T110000
DTSTAMP:20231013T204741Z
CREATED:20231013T204741Z
LAST-MODIFIED:20231013T204741Z
UID:6467-1697709600-1697713200@qmi.miffanytark.com
SUMMARY:CM Seminar: Marcel Franz – Quantum Matter Institute: d-mon: an improved transmon qubit based on a cuprate Josephson junction
DESCRIPTION:Marcel Franz – Quantum Matter Institute\nTitle: d-mon: an improved transmon qubit based on a cuprate Josephson junction \n  \nAbstract: Transmon qubit\, based on a superconducting Josephson junction shunted by a large capacitance\, is the workhorse component powering the majority of intermediate scale quantum computers currently in operation. I this talk I will describe a theoretical proposal for a novel transmon architecture dubbed “d-mon” that uses unconventional oxide superconductors and is designed to overcome one of the key shortcomings of the conventional transmon. The proposed d-mon architecture is based on a c-axis Josephson junction between a d-wave high-Tc cuprate and a conventional s-wave superconductor. Its chief advantage lies in the large and tunable anharmonicity of its energy spectrum that we predict should enable faster and more reliable gate operation. In contrast to some earlier cuprate-based qubit designs d-mon operates in the regime where quasiparticles are fully gapped and can be therefore expected to achieve long coherence times. \nSpeaker Bio: Marcel Franz is a Professor of Physics at The University of British Columbia and a Deputy Scientific Director of The Blusson Quantum Matter Institute. Franz is a leading expert in theories of topological quantum matter\, unconventional superconductivity and strongly correlated electron systems. His group has made a number of significant advances in these fields including the recent prediction of high-temperature topological superconductivity in twisted bilayers of cuprate superconductors. Franz has received numerous awards and recognitions for his contributions including the A.P. Sloan Fellowship (2002)\, Killam Research Fellowship (2007)\, has been elected Fellow of the APS (2014) and The Royal Society of Canada (2022). He obtained his PhD at The University of Rochester in 1994 and worked as a postdoctoral fellow and McMaster and Johns Hopkins universities before joining the faculty of The University of British Columbia in 2000.
URL:https://qmi.miffanytark.com/event/cm-seminar-marcel-franz-quantum-matter-institute-d-mon-an-improved-transmon-qubit-based-on-a-cuprate-josephson-junction/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20231012T100000
DTEND;TZID=America/Vancouver:20231012T110000
DTSTAMP:20231006T213542Z
CREATED:20231006T213542Z
LAST-MODIFIED:20231006T213542Z
UID:6427-1697104800-1697108400@qmi.miffanytark.com
SUMMARY:CM Seminar: Lea Nienhaus – Florida State University: Stressing Halide Perovskites
DESCRIPTION:Lea Nienhaus – Florida State University\nTitle: Stressing Halide Perovskites: Nanoscale Investigation of the Properties of Perovskite Thin Films \nAbstract: Solution-processed perovskite thin films consist of small grains with a size of 20 – 2000 nm connected by grain boundaries. As a result\, there is a vast inhomogeneity in the optical and electronic properties of the different grains/GBs within one film\, which can reduce the achievable energy output. In addition\, facile ion movement under external stimuli (light or electric fields) adds additional complexity to the system. However\, solvents can also be used to change the surface doping\, which can have immense impact on energy or charge transfer at the perovskite surface. \nTo gain insight into the optoelectronic and structural response of the perovskite thin film to these external stressors present under operating conditions\, we utilize a combination of scanning tunneling microscopy (STM) and optical spectroscopy. Furthermore\, single molecule absorption STM (SMA-STM) can probe the local inhomogeneity of the surface properties of the perovskite thin film under illumination by locally mapping the additional photogenerated tunneling current. To understand whether the local changes are caused by optoelectronic changes under illumination or structural changes\, we utilize synchrotron X-ray STM (SX-STM). Pump-probe wide-angle X-ray scattering indicates the presence of lattice deformations under optical illumination\, highlighting that the photocarriers distort the lattice\, and thus\, can change the underlying density of states as observed by SMA-STM. \nSpeaker bio: Lea Nienhaus obtained her PhD from UIUC in 2015. Following her postdoc at MIT\, she transitioned to FSU in 2018. Her interests are geared towards pushing the boundaries of optical spectroscopy. Outside of lab\, you can find her playing with her cats\, biking\, swimming or cooking. Additionaly\, she enjoys shining UV lights on household objects.
URL:https://qmi.miffanytark.com/event/cm-seminar-lea-nienhaus-florida-state-university-stressing-halide-perovskites/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230928T100000
DTEND;TZID=America/Vancouver:20230928T110000
DTSTAMP:20230925T213140Z
CREATED:20230925T213140Z
LAST-MODIFIED:20230925T213140Z
UID:6418-1695895200-1695898800@qmi.miffanytark.com
SUMMARY:CM Seminar: Ting Ge – University of South Carolina: Mechanics of Non-Concatenated Ring Polymers – Effects of Topology Revealed by Molecular Simulations
DESCRIPTION:Ting Ge – University of South Carolina\nTitle: Mechanics of Non-Concatenated Ring Polymers – Effects of Topology Revealed by Molecular Simulations \nAbstract: Few aspects are as prevalent and important as topology in polymer mechanics\, which provides an essential foundation for versatile functions of polymeric materials. Recent advances in chemistry have enabled the precise synthesis of non-concatenated ring polymers with distinctive topology. While many aspects of the statics and dynamics of ring polymers have been elucidated in the past several decades\, the structure-property relationship has not been completely established for ring polymer mechanics. Using molecular simulations with perfect control of polymer topology\, we make elastomers and thermoplastics out of non-concatenated ring polymers and investigate their mechanical properties during large deformation and failure. The simulations reveal that the elastomers made of cross-linked ring polymers are significantly more stretchable than cross-linked linear polymers [1]. Compared to linear polymers\, the entanglements between ring polymers do not act as effective cross-links. As a result\, the stretchability of cross-linked ring polymers is determined by the maximum extension of polymer strands between cross-links rather than between trapped entanglements as in cross-linked linear polymers. The simulations also reveal that the thermoplastics made of ring polymers fail through crazing as their linear counterparts under tensile loading [2]. The stable craze formation indicates the existence of an entanglement network in glassy ring polymers. Nevertheless\, the entanglement network consists of only a fraction of the topological constraints that determine the conformations of ring polymers. Both the structural features of the ring polymer craze and the drawing stress during the craze formation are related to the underlying entanglement network. Besides the simulations\, molecular theories have been developed to delineate the mechanical behaviors of ring elastomers and ring thermoplastics. The studies demonstrate the use of ring polymers as a transformative pathway to tailor polymer mechanics\, propelling a new paradigm of topological polymer physics entering materials science. \n[1] “Superstretchable elastomer from cross-linked ring polymers”\, J. Wang\, T. C. O’Connor\, G. S. Grest\, and T. Ge\, Physical Review Letters 128\, 237801 (2022).\n[2] “Crazing reveals an entanglement network in glassy ring polymers”\, J. Wang and T. Ge\, Macromolecules 54\, 7500 (2021).
URL:https://qmi.miffanytark.com/event/cm-seminar-ting-ge-university-of-south-carolina-mechanics-of-non-concatenated-ring-polymers-effects-of-topology-revealed-by-molecular-simulations/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230921T100000
DTEND;TZID=America/Vancouver:20230921T113000
DTSTAMP:20230905T161210Z
CREATED:20230905T161210Z
LAST-MODIFIED:20230905T161210Z
UID:6347-1695290400-1695295800@qmi.miffanytark.com
SUMMARY:CM Seminar: Lesley Cohen – Chair of the Advisory Board: Non-collinear Mn3NiN Antiferromagnets
DESCRIPTION:Lesley Cohen – Chair of the Advisory Board\nTitle: Non-collinear Mn3NiN Antiferromagnets \nAbstract: Antiferromagnets (AFM) hold interest because of their potential for application in high density\, high speed spintronic devices\, as  an active layer and also as a component in superconducting S/AFM/S Josephson Junctions. Frustrated non-collinear antiferromagnets offer additional attractive functional properties due to their magnetic space group symmetry. Stimulated first by the prediction of piezomagnetism we embarked on a growth program of Mn3NiN films on various perovskite substrates by pulsed laser deposition. In this talk I will review the evidence for piezomagnetism and our observation of the anomalous Hall effect. We use scanning imaging of the anomalous Nernst effect to provide information about domain structure in our films. The phase diagram of magnetic order with biaxial strain in this family of materials predicts that compressively strained films should support a collinear ferrimagnetic phase as shown in the figure below. I will discuss the properties of this phase and implications and the magneto-optical properties crossing from the antiferromagnetic to ferrimagnetic phase. \nSpeaker Bio: Lesley Cohen is a Professor of Solid State Physics at Imperial College London. Her research focuses on quantum interference for organic thermoelectric\, energy-efficient solid-state caloric cooling\, competing for exchange antiferromagnets for spintronics and long-range triplet superconductivity. She is currently the Consul for the Faculty of Natural Sciences and Education at Imperial College and recently stepped down as head of Experimental Condensed Matter. She received the Imperial College Julia Higgins Award for her contribution to the promotion and support of women in science and remains committed to equality and diversity within STEM. \nDr. Cohen has served on numerous Boards including Superconductivity\, Science and Technology; Imperial College Consultants ICON; the Education Board for the Institute of Physics; Kings College London Science Advisory Board; and the External Advisory Board of IFW Dresden and the EPSRC Materials Strategic Advisory Technical Panel.
URL:https://qmi.miffanytark.com/event/cm-seminar-lesley-cohen-chair-of-the-advisory-board-non-collinear-mn3nin-antiferromagnets/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230914T100000
DTEND;TZID=America/Vancouver:20230914T113000
DTSTAMP:20230905T164704Z
CREATED:20230905T164704Z
LAST-MODIFIED:20230905T164704Z
UID:6354-1694685600-1694691000@qmi.miffanytark.com
SUMMARY:CM Seminar: Mattias Fitzpatrick – Dartmouth College: Quantum Simulation with Superconducting Circuits: Synthetic Quantum Matter to Non-Hermitian Sensing
DESCRIPTION:Mattias Fitzpatrick – Dartmouth College\nTitle: Quantum Simulation with Superconducting Circuits: Synthetic Quantum Matter to Non-Hermitian Sensing \nAbstract: In recent years\, superconducting circuits have garnered much attention due to their use in quantum computers and quantum annealers. However\, this technological platform can also be used to study problems in condensed matter and many-body physics where microwave photons are the particles of interest and interactions are engineered using superconducting qubits or other nonlinearities. In this talk\, I will describe my work building hyperbolic superconducting circuit lattices and the associated flat bands that arise in their band structure. From here\, I will discuss recent work in my new lab at Dartmouth\, where we have developed a means of controlling the effective photon hopping in lattices. Using directional amplification and phase shifters\, I will show how to create effectively tunable hopping rates in the Hermitian and non-Hermitian domains. Finally\, I will discuss nonlinearities in the gain-dominated regime and their implications for self-oscillation sensors.
URL:https://qmi.miffanytark.com/event/cm-seminar-mattias-fitzpatrick-dartmouth-college-quantum-simulation-with-superconducting-circuits-synthetic-quantum-matter-to-non-hermitian-sensing/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230302T100000
DTEND;TZID=America/Vancouver:20230302T110000
DTSTAMP:20230217T194855Z
CREATED:20230217T194855Z
LAST-MODIFIED:20230217T194855Z
UID:5444-1677751200-1677754800@qmi.miffanytark.com
SUMMARY:CM Seminar: John Birkbeck – Weizmann Institute of Science: The Quantum Twisting Microscope
DESCRIPTION:John Birkbeck – Department of Condensed Matter Physics\, Weizmann Institute of Science.\nTitle: The Quantum Twisting Microscope\n \nAbstract: In this talk\, I will present a new type of scanning probe microscope\, the Quantum Twisting Microscope (QTM)\, capable of performing local quantum interference measurements at a twistable interface between two quantum materials. Its working principle is based on a unique tip made of an atomically-thin two-dimensional material. This tip allows electrons to coherently tunnel into a sample at many locations at once\, with quantum interference between these tunneling events\, making it a scanning electronic interferometer. With an extra twist degree of freedom\, our microscope becomes a momentum-resolving local probe\, providing powerful new ways to study the energy dispersions of interacting electrons. I will present various experiments performed with this microscope\, demonstrating quantum interference at room temperature\, probing the conductance of in-situ twisting interfaces\, and imaging local energy dispersions of graphene and twisted bilayer graphene. \nSpeaker Bio: I am a postdoctoral researcher working at the Weizmann Institute of Science with Prof. Shahal Ilani. I completed my Ph.D. with Prof. Andre Geim and Prof. Irina Grigorieva at the University of Manchester\, UK. My research focuses on using unique scanning probe microscopes to visualize the electronic properties of 2D materials and vdW heterostructures.
URL:https://qmi.miffanytark.com/event/cm-seminar-john-birkbeck-weizmann-institute-of-science-the-quantum-twisting-microscope/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230209T100000
DTEND;TZID=America/Vancouver:20230209T110000
DTSTAMP:20230207T184815Z
CREATED:20230207T184815Z
LAST-MODIFIED:20230207T184815Z
UID:5398-1675936800-1675940400@qmi.miffanytark.com
SUMMARY:CM Seminar:  Dmitri Pikulin – Microsoft: Aspects of Microsoft’s recent topological gap study
DESCRIPTION:Dmitri Pikulin – Microsoft \nTitle: Aspects of Microsoft’s recent topological gap study \nAbstract: I will discuss the theory and data analysis techniques behind the recent study searching for Majorana zero modes. I will describe how the transport techniques can help identify the boundary and bulk signatures of the topological phase. The analytical insight is confirmed by extensive numerical study and data analysis. I will finish with an example of an experimental observation.
URL:https://qmi.miffanytark.com/event/cm-seminar-dmitri-pikulin-microsoft-aspects-of-microsofts-recent-topological-gap-study/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230202T100000
DTEND;TZID=America/Vancouver:20230202T110000
DTSTAMP:20230116T182058Z
CREATED:20230116T182058Z
LAST-MODIFIED:20230116T182058Z
UID:5301-1675332000-1675335600@qmi.miffanytark.com
SUMMARY:CM Seminar: Patrick Ledwith – Harvard  University: Vortexability Chern bands in Twisted and Strained Graphene
DESCRIPTION:Patrick Ledwith – Harvard University \nTitle: Vortexability Chern bands in Twisted and Strained Graphene \nAbstract: Fractional Chern insulators realize the remarkable physics of the fractional quantum Hall effect (FQHE) in crystalline systems with Chern bands. The lowest Landau level (LLL) is known to host the FQHE\, but not all Chern bands are suitable for realizing fractional Chern insulators (FCI). Previous approaches to stabilizing FCIs focused on mimicking the LLL through momentum space criteria. Here instead we take a real-space perspective by introducing the notion of vortexability. Vortexable Chern bands admit a fixed operator that introduces vortices into any band wavefunction while keeping the state entirely within the same band. Vortexable bands admit trial wavefunctions for FCI states\, akin to Laughlin states. In the absence of dispersion and for sufficiently short ranged interactions\, these FCI states are the ground state — independent of the distribution of Berry curvature. Vortexable Chern bands were found to emerge naturally in chiral twisted graphene\, and fractional Chern insulators were subsequently observed experimentally. They were also recently proposed in periodically strained graphene. \nBio: Patrick Ledwith grew up near Philadelphia\, Pennsylvania. He got his undergraduate degree in Physics and Mathematics at MIT. There he worked with Leonid Levitov on electron hydrodynamics\, discovering and elucidating long-lived collective excitations in two-dimensional electron gases. He is now a graduate student working in Ashvin Vishwanath’s group. Here he has worked on several aspects of moiré materials including fractional Chern insulators\, superconductivity\, correlated insulators\, and topological charge density waves. He has been especially interested in developing analytic approaches to fractional Chern insulators. He has applied these methods to twisted bilayer graphene where they work especially well. He subsequently partnered with Amir Yacoby’s group in realizing and understanding experimentally observed fractional Chern insulating states at small magnetic fields. In his free time\, he likes to cook and play video games with his dog.
URL:https://qmi.miffanytark.com/event/cm-seminar-patrick-ledwith-harvard-university-vortexability-chern-bands-in-twisted-and-strained-graphene/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230126T100000
DTEND;TZID=America/Vancouver:20230126T110000
DTSTAMP:20230118T230827Z
CREATED:20230118T230827Z
LAST-MODIFIED:20230118T230827Z
UID:5306-1674727200-1674730800@qmi.miffanytark.com
SUMMARY:CM Seminar: Alannah Hallas: Entropy Engineering and Tunable Magnetic Order in the Spinel High Entropy Oxide
DESCRIPTION:Dr. Alannah Hallas: Blusson Quantum Matter Institute \nTitle: Entropy engineering and tunable magnetic order in the spinel high entropy oxide \nAbstract: The field of high entropy oxides (HEOs) flips traditional materials science paradigms on their head by seeking to understand what properties arise in the presence of profound configurational disorder. This disorder\, which emerges as the result of multiple elements sharing a single crystalline lattice\, can take on a kaleidoscopic character due to the vast numbers of possible elemental combinations and appears to imbue some HEOs with functional properties that far surpass their conventional analogs. While experimental discoveries abound\, efforts to characterize the true magnitude of the configurational entropy and understand its role in stabilizing new phases and generating superior functional properties have lagged behind. Understanding the role of configurational disorder in existing HEOs is the crucial link to unlocking the rational design of new HEOs with targeted properties. In this talk\, I will discuss our group’s efforts to establish a framework for articulating and beginning to address these questions towards achieving a complete understanding of the true role of entropy in HEOs. \nBio: Alannah Hallas is an Assistant Professor in the Department of Physics & Astronomy at UBC\, a Principal Investigator at the Stewart Blusson Quantum Matter Institute\, and a CIFAR Azrieli Global Scholar in Quantum Materials. Alannah’s research program is focused on the design\, discovery\, and crystal growth of new quantum materials\, leveraging a wide range of advanced crystal growth techniques. Her group characterizes the quantum magnetic properties of their materials using x-ray and neutron scattering as well as muon spin relaxation techniques.
URL:https://qmi.miffanytark.com/event/cm-seminar-alannah-hallas-entropy-engineering-and-tunable-magnetic-order-in-the-spinel-high-entropy-oxide/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230119T100000
DTEND;TZID=America/Vancouver:20230119T110000
DTSTAMP:20230103T192036Z
CREATED:20230103T192036Z
LAST-MODIFIED:20230103T192036Z
UID:5253-1674122400-1674126000@qmi.miffanytark.com
SUMMARY:CM Seminar: Mark Rudner: “The Lindblad Quantum Master Equation: Not Just for quantum Optics Anymore"
DESCRIPTION:Prof. Mark Rudner – University of Washington \nTitle: “The Lindblad Quantum Master Equation: Not Just for quantum Optics Anymore” \nAbstract: With the exception of the universe as a whole\, the evolution of a quantum system is generically non-unitary due to the coupling between the system and its environment. In quantum optics\, the powerful framework of Lindblad master equations has been developed and employed for many years to describe the effective evolution of atomic-like systems in the presence of electromagnetic and other environmental degrees of freedom. Importantly\, explicit derivations of Lindblad master equations have traditionally relied on highly restrictive assumptions on energy level spacings that limit its applicability to few-level/few-body systems. In this talk I will review the basic features of evolution of open quantum systems\, and describe a new route to obtaining the Lindblad equation which circumvents all restrictive assumptions on the nature of the system at hand. This “universal Lindblad equation” can therefore be applied to a wide range of many-body systems\, including emerging quantum hardware with several to many coupled qubits and many-body systems driven far from equilibrium. The explicit expressions for the “jump operators” that describe incoherent processes induced by the bath have a natural interpretation in terms of an operator spreading picture\, akin to that which has recently provided much insight into thermalization of closed quantum systems. I will conclude with a discussion of future prospects and applications of this new framework. \nBio: Mark Rudner is the Kenneth K. Young Memorial Professor of Physics at the University of Washington. His research interests span a broad range of topics in theoretical condensed matter physics and quantum dynamics. Following his PhD at MIT\, in which he studied classical and quantum control in solid state spin and superconducting qubits\, as well as transport in graphene\, in 2008 Mark moved to Harvard for a postdoctoral fellowship. During this time\, he developed foundational works on topological phenomena in both driven (“Floquet”) and open (non-Hermitian) quantum systems. In 2012\, Mark moved to Copenhagen\, where he joined the Center for Quantum Devices at the Niels Bohr Institute and took charge of the Condensed Matter Theory group at the Niels Bohr International Academy. Over the next decade\, Mark maintained a role as one of the leaders in the emerging fields of Floquet engineering and non-equilibrium quantum dynamics\, while further exploring novel (linear and non-linear) collective phenomena that arise from the interplay of quantum geometry and interparticle interactions. In 2021 Mark joined the University of Washington\, where he is continuing these efforts while expanding into new directions in collaboration with his experimental and theoretical colleagues.
URL:https://qmi.miffanytark.com/event/cm-seminar-mark-rudner-the-lindblad-quantum-master-equation-not-just-for-quantum-optics-anymore/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221201T100000
DTEND;TZID=America/Vancouver:20221201T110000
DTSTAMP:20221104T225912Z
CREATED:20221104T225912Z
LAST-MODIFIED:20221104T225912Z
UID:5042-1669888800-1669892400@qmi.miffanytark.com
SUMMARY:CM Seminar: Thomas Scaffidi - Spread and Erase - How Electron Hydrodynamics Can Eliminate the Landauer-Sharvin Resistance
DESCRIPTION:Thomas Scaffidi – University of California Irvine \nTitle: Spread and Erase – How Electron Hydrodynamics Can Eliminate the Landauer-Sharvin Resistance \nAbstract: What is the ultimate limit of conductance of a metallic device of lateral size W? In the ballistic limit\, the answer is the Landauer-Sharvin conductance\, which is associated with an abrupt reduction of the number of conducting channels when going from the contacts to the device. However\, the ballistic limit is not always the best-case scenario\, since adding strong electron-electron scattering can take electrons to a viscous regime of transport for which “super-ballistic” flows were recently studied. In this talk\, we will show that by a proper choice of geometry which resembles a “wormhole”\, it is possible to spread the Landauer-Sharvin resistance throughout the bulk of the system\, allowing its complete elimination by electron hydrodynamics. This effect arises due to the interplay between geometry and strong electron-electron scattering\, which allows for a net transfer of carriers from reflected to transmitted channels. Finally\, we will discuss a recent experiment in a Corbino geometry which realizes one half of this “wormhole” geometry. \nRefs:\nTheory: Phys. Rev. Lett. 129\, 157701 (2022)\nExperiment: Nature 609\, 276–281 (2022) \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-thomas-scaffidi-spread-and-erase-how-electron-hydrodynamics-can-eliminate-the-landauer-sharvin-resistance/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221124T100000
DTEND;TZID=America/Vancouver:20221124T110000
DTSTAMP:20221108T200540Z
CREATED:20221108T200540Z
LAST-MODIFIED:20221108T200540Z
UID:5048-1669284000-1669287600@qmi.miffanytark.com
SUMMARY:CM Seminar: Long Ju - Electron Correlation and Coupling with Phonon in the Trilayer Graphene/hBN Moire Superlattice
DESCRIPTION:Long Ju – MIT Physics Department  \nTitle: Electron Correlation and Coupling with Phonon in the Trilayer Graphene/hBN Moire Superlattice \nAbstract: ABC-stacked trilayer graphene/hexagonal boron nitride moiré superlattice (TLG/hBN) has emerged as a playground for correlated electron physics. A spectroscopy study of this system is\, however\, challenging due to the device configuration. In this talk\, I will introduce our recent efforts on FTIR photocurrent spectroscopy measurements of dual-gated TLG/hBN. We observed strong gate-tunable optical transitions that originated from the moire flat band. At half-filling of the valence flat band\, a broad absorption peak emerges at ~18 meV\, indicating direct optical excitation across an emerging Mott gap. Furthermore\, I will talk about a unique moire-enabled interlayer electron-phonon coupling phenomenon in this system. The ZO phonon in hBN hybridizes with electron-hole excitations in trilayer graphene and appear as an asymmetric peak in the photocurrent spectrum. This Fano line-shaped peak evolves continuously as we tune the displacement field. I’ll talk about the implications of this phenomenon to engineering the physics of moire quantum matters. \nBio: Long Ju joined the MIT Physics Department as an assistant professor in January 2019. He received his B.S. in Physics in 2009 from Tsinghua University\, China\, and his Ph.D. in Physics in 2015 from the University of California\, Berkeley. He then moved to Cornell University\, where he was a Kavli postdoctoral fellow until December 2018. \n  \n​ \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-long-ju-electron-correlation-and-coupling-with-phonon-in-the-trilayer-graphene-hbn-moire-superlattice/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221117T100000
DTEND;TZID=America/Vancouver:20221117T110000
DTSTAMP:20221110T004813Z
CREATED:20221110T004813Z
LAST-MODIFIED:20221110T004813Z
UID:5058-1668679200-1668682800@qmi.miffanytark.com
SUMMARY:CM Seminar: Professor Kai-Mei C Fu - Quantum Point Defects: Can These Defects Be Less Defective?
DESCRIPTION:Professor Kai-Mei C Fu –  University of Washington  \nTitle: Quantum point defects: Can these defects be less defective? \nAbstract: Point defects in crystals are the solid state analog to trapped ions. Thus these “quantum defects”\, which can be integrated into solid-state devices\, have gained popularity as qubit candidates for scalable quantum networks. In this talk\, I will introduce some of the basic quantum defect properties desirable for quantum network applications. I will highlight my own group’s efforts at understanding and controlling the properties of defects in diamond including (1) synthesis\, frequency and emission control of deep-level vacancy complexes in diamond and (2) properties of shallow-level donors in ZnO\, including single donors and intentionally synthesized donors in ZnO. \nBio: Kai-Mei Fu is the Virginia and Prentice Bloedel Professor of Physics and Electrical and Computer Engineering at the University of Washington and holds a dual appointment with the Pacific Northwest National Laboratory. Kai-Mei received their PhD in Applied Physics \nin 2007 from Stanford University. Their research focuses on the synthesis\, characterization and control of optically active quantum defects in crystals\, with applications in quantum networks and sensing. At UW\, Kai-Mei is the Director of UW’s NSF National Research Training Program: Accelerating Quantum-Enabled Technologies and the co-chair of UW’s interdisciplinary QuantumX Steering Committee.  They are also the Deputy Director of the Department of Energy National Quantum Initiative (NQI) Co-design Center for Quantum Advantage. In their free time\, Kai-Mei enjoys spending time with their family outdoors in the beautiful Pacific Northwest. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-professor-kai-mei-c-fu-quantum-point-defects-can-these-defects-be-less-defective/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221110T100000
DTEND;TZID=America/Vancouver:20221110T110000
DTSTAMP:20221026T201345Z
CREATED:20221026T201345Z
LAST-MODIFIED:20221026T201345Z
UID:5020-1668074400-1668078000@qmi.miffanytark.com
SUMMARY:CM Seminar: Joyce Poon: Visible-light Silicon Integrated Photonics for Future Computing
DESCRIPTION:Joyce Poon – University of Toronto \nTitle: Visible-light Silicon Integrated Photonics for Future Computing \nAbstract: The emerging demands of computing require hardware advances to realize new types of computing architectures and interfaces. Foundry silicon photonics leverages the maturity of microelectronics manufacturing to fabricate photonic integrated circuits. Today\, silicon photonics is mostly used in the short-wave infrared spectrum for optical communications. I will discuss how foundry silicon photonics in the visible spectrum is an enabling technology for future computing\, addressing applications such as displays\, neural implants\, and quantum computing. \nBiography: Joyce Poon is the Managing Director at the Max Planck Institute of Microstructure Physics\, a Professor of Electrical and Computer Engineering at the University of Toronto\, and an Honorary Professor in the Faculty of Electrical Engineering and Computer Science at the Technical University of Berlin.  She currently serves as a Director-at-Large for Optica (formerly the Optical Society\, OSA). She and her team specialize in integrated photonics on silicon.  Prof. Poon obtained the Ph.D. in Electrical Engineering from Caltech in 2007. She is a Optica Fellow and a Fellow of the IEEE.
URL:https://qmi.miffanytark.com/event/cm-seminar-joyce-poon-visible-light-silicon-integrated-photonics-for-future-computing/
CATEGORIES:CM Seminar,Student event
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221103T100000
DTEND;TZID=America/Vancouver:20221103T110000
DTSTAMP:20221011T201725Z
CREATED:20221011T201725Z
LAST-MODIFIED:20221011T201725Z
UID:4970-1667469600-1667473200@qmi.miffanytark.com
SUMMARY:CM Seminar: Professor Romain Vasseur - Anomalous Diffusion in Quantum Spin Chains
DESCRIPTION:Professor Romain Vasseur – University of Massachusetts\, Amherst \nTitle: Anomalous diffusion in quantum spin chains  \nAbstract: High-temperature quantum transport is usually assumed to be incoherent and diffusive.  In this talk\, I will explain how anomalous transport in quantum spin chains can emerge from proximity to special integrable limits\, due to a hierarchy of long-lived quasiparticle excitations. I will summarize our understanding of finite-temperature transport in integrable spin chains\, and argue that integrability-breaking perturbations can generically lead to either super- or subdiffusion up to very long-time scales. \nBio: Romain Vasseur is an Associate Professor in the Physics Department of the University of Massachusetts\, Amherst.  He is a condensed matter theorist working on strongly correlated quantum systems and quantum information\, with a focus on the interplay of strong interactions and quantum entanglement\, leading to new emergent phenomena both in thermal equilibrium and in non-equilibrium quantum systems. Before moving to Amherst\, Dr. Vasseur was a Postdoctoral Fellow at Lawrence Berkeley National laboratory (2013-2017)\, working in the Condensed Matter Theory Center at the University of California\, Berkeley. He obtained his PhD at IPhT (CEA\, Saclay) and LPTENS (ENS\, Paris) in 2013. Prof. Vasseur has been recognized as a fellow of the Alfred P. Sloan Foundation (2019) and an Early Career Award of the US Department of Energy (2018). He is also the recipient of a Young Investigator Award of the US Air Force Office of Scientific Research (2020). \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-professor-romain-vasseur-anomalous-diffusion-in-quantum-spin-chains/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221013T100000
DTEND;TZID=America/Vancouver:20221013T110000
DTSTAMP:20221004T221006Z
CREATED:20221004T221006Z
LAST-MODIFIED:20221004T221006Z
UID:4950-1665655200-1665658800@qmi.miffanytark.com
SUMMARY:CM Seminar: Dr. Anushya Chandran - Quantization of Dynamics in Quasi-periodically Driven Systems
DESCRIPTION:Dr. Anushya Chandran: Boston University \nTitle: Quantization of dynamics in quasi-periodically driven systems \nAbstract: In the past decade\, quantum simulators have increased in their power and scope\, offering exquisite dynamical control of tens or even hundreds of individual atoms/ions. \nConcurrently\, a topological revolution in our understanding of electronic band structures has taken place\, driven by the discovery of topological insulators\, graphene and other topological materials. Remarkably\, these advances can be connected — the dynamics of driven few level systems can be described using band structures in “synthetic dimensions\,” one per driving tone. Topological order in the synthetic band structure then leads to quantized dynamical responses in the quantum simulator. \nIn this talk\, I will use a unifying frequency lattice construction to reveal non-adiabatic topological responses in quasi-periodically driven systems. We will find that quasi-periodically driven qubits already exhibit topologically distinct dynamical phases\, and that a 2-tone driven wire can function as a quantized energy pump at any temperature. The latter system provides one of the few examples of many-body localization protected order that is absolutely stable. I will argue that the quantized energy pumping regime is accessible in near-term optical and microwave cavity-QED experiments\, and that furthermore\, it is useful to prepare highly excited non-classical cavity states and entangled cavity-qubit states. \nBio: Anushya Chandran studies the organizing principles of quantum systems far from equilibrium. Her research sheds light on the process of thermalization\, designs protocols to achieve non-trivial quantum dynamics\, and informs near-term quantum device design. Anushya hails from India\, where she studied at the Indian Institute of Technology in Madras. She received her PhD from Princeton University and performed post-doctoral research at Perimeter Institute before joining Boston University. She is the recipient of the Sloan fellowship and the NSF young investigator career award. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-dr-anushya-chandran-quantization-of-dynamics-in-quasi-periodically-driven-systems/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220929T100000
DTEND;TZID=America/Vancouver:20220929T110000
DTSTAMP:20220921T164849Z
CREATED:20220921T164849Z
LAST-MODIFIED:20220921T164849Z
UID:4927-1664445600-1664449200@qmi.miffanytark.com
SUMMARY:CM Seminar: Dr. Tina Rost\, High Entropy Ceramics: Investigating localized structural effects on emerging properties
DESCRIPTION:Speaker: Dr. Tina Rost \nDate: Thursday September 29 2022 \nTime: 10:00 am – 11:00 AM PST \nLocation: Zoom \nZoom Link: https://ubc.zoom.us/j/64243489212?pwd=YkFSMDdxN3Nhbm15aExBdTF6MnBvQT09 \nMeeting ID: 642 4348 9212 \nPasscode: 742838 \n  \nAbstract\nMany properties we observe in materials are a direct consequence of their composition and local structure. High entropy materials are a unique class of systems that do not have a primary composition; rather they contain a near-equimolar distribution of several elements— where no single element serves as host. Such compositional disorder is accompanied by a unique distribution of localized structural distortions that can have a profound effect on properties such as thermal conductivity\, magnetic interaction\, diffusion\, and more. To date\, high entropy metals and ceramics are gaining significant traction in the materials community as unique and interesting properties continue to emerge\, from amorphous-like thermal conductivities to exotic magnetic states. In this talk\, we present and discuss ongoing work on the local characterization of several high entropy compositions exhibiting crystal structures from rocksalts to Kagome lattices. In particular\, the use of X-ray absorption fine structure (XAFS) is demonstrated to aid in understanding such disorder on the local level and how it may influence functional properties \n  \nSpeaker Bio\nDr. Christina Rost is currently an Assistant Professor of Physics at James Madison University in Harrisonburg\, VA. She graduated with a Ph.D. in Materials Science and Engineering from North Carolina State University in 2016\, following both a B.S. and an M.S. in Physics from Indiana University of Pennsylvania. Her Ph.D. focused on the development and phase-characterization of a novel class of oxide systems stabilized through configurational disorder\, named “Entropy Stabilized Oxides”.   After graduation\, Tina was Postdoctoral Research Associate in the Experiments and Simulations in Thermal Engineering (ExSITE) group\, within the Department of Mechanical and Aerospace Engineering at the University of Virginia. There\, her work focused on experimental methods to test thermal properties at extremely high temperatures and thermal transport in complex and high-entropy oxides and carbides. Currently\, her all-undergraduate research group at JMU focuses efforts on complex oxide synthesis and characterization. She is an active member of the American Ceramics Society and the American Physical Society.
URL:https://qmi.miffanytark.com/event/cm-seminar-high-entropy-ceramics-investigating-localized-structural-effects-on-emerging-properties/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220407T100000
DTEND;TZID=America/Vancouver:20220407T110000
DTSTAMP:20220330T201042Z
CREATED:20220330T201042Z
LAST-MODIFIED:20220330T201042Z
UID:4248-1649325600-1649329200@qmi.miffanytark.com
SUMMARY:Dr. Valentino R. Cooper: Exploring the Chemical Landscape of High Entropy Oxides
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\nSpeaker: Dr. Valentino R. Cooper \nTitle: Exploring the Chemical Landscape of High Entropy Oxides \nAbstract: High entropy\, multi-component metal alloys (HEA)\, have superior mechanical properties and high radiation tolerances; which are\, in part\, driven by configurational entropy. Recently\, an oxide analogue comprised of MgO\, CoO\, NiO\, CuO and ZnO was synthesized; exhibiting a truly entropy-stabilized\, reversible phase transition from a multiphase material to a single rock salt-ordered phase above 850-900°C. This entropy-driven stabilization may engender many unique properties\, such as high melting temperatures\, radiation resistance and other anomalous responses. Here\, we discuss a design strategy for the prediction of synthesizable disordered oxides. Our effort employs first principles studies of 2-component oxides to develop design rules based on the relationship between pairwise enthalpies of formation\, DH\, and configurational entropy of the disordered material. A similar chemical identity-to-DH map was previously explored using the class of high entropy alloys\, where the stability of multicomponent metal alloys was correlated to the enthalpy of mixing of binary and ternary compounds. \nIn this presentation\, I will focus on our recent efforts to employ this local enthalpy map as an effective strategy for the discovery of new classes of entropy stabilized oxides. In particular\, we are able to use our first principles calculations with Monte Carlo simulations in order to build chemical bonding maps to study the local environment preferences that determine whether a material will phase segregate\, to form a single phase with clustered regions\, or form a disordered solid solution. This enables us to identify compounds that may be synthesizable or could be stabilized by entropy – thus allowing for more reliable materials discovery and design. \nThis work was supported by the U.S. D.O.E.\, Office of Science\, BES\, MSED (first principles calculations) and the LDRD Program of ORNL (simulations)\, managed by UT-Battelle\, LLC\, for the U. S. DOE using resources at NERSC and OLCF. \nBio: \n \nDr. Valentino R. Cooper is the Section Head for the Materials Theory Modeling and Simulations section in the Materials Sciences and Technology Division at Oak Ridge National Laboratory. He received his Ph. D from the Chemistry Department at the University of Pennsylvania in 2005. Prior to joining ORNL in 2008\, he was a post-doctoral associate in the Physics Department of Rutgers University. His research focuses on electronic structure methods for understanding dispersion interactions and in the prediction of functional materials including piezoelectrics and ferroelectrics. Dr. Cooper is a 2013 recipient of the Department of Energy Early Career award.
URL:https://qmi.miffanytark.com/event/dr-valentino-r-cooper-exploring-the-chemical-landscape-of-high-entropy-oxides/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220331T100000
DTEND;TZID=America/Vancouver:20220331T110000
DTSTAMP:20220323T181708Z
CREATED:20220323T181708Z
LAST-MODIFIED:20220323T181708Z
UID:4194-1648720800-1648724400@qmi.miffanytark.com
SUMMARY:Kwabena Bediako: New Twists on Chemistry and Physics in Moiré Superlattices
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\nSpeaker: Kwabena Bediako\, Assistant Professor at UC Berkeley\, Dept. of Chemistry \nTitle: New twists on chemistry and physics in moiré superlattices     \nAbstract: Atomically thin or two-dimensional (2D) materials can be assembled into bespoke heterostructures to produce some extraordinary physical phenomena. Likewise\, these highly tunable materials are useful platforms for exploring fundamental questions of interfacial chemical/electrochemical reactivity. One exciting and relatively recent example is the formation of moiré superlattices from azimuthally misoriented (twisted) layers. These moiré superlattices result in flat bands that lead to an array of correlated electronic phases. However\, in these systems\, complex strain relaxation can also strongly influence the fragile electronic states of the material. Precise characterization of these materials and their properties is therefore critical to the understanding of the behavior of these novel moiré materials (and 2D heterostructures in general). In this talk\, I will discuss how spontaneous mechanical deformations (atomic reconstruction) and resultant intralayer strain fields at moiré superlattices of twisted bilayer graphene have been quantitatively imaged using 4D-STEM Bragg interferometry. I will also discuss the impact of these mechanical deformations to the electronic band structure of these moiré superlattices and the correlated electronic phases they host. The talk will then explore how various degrees of freedom that are unique to 2D materials may be used to tailor interfacial chemistry at well-defined mesoscopic electrodes and the outlook for new paradigms of functional materials for energy conversion and low-power electronic devices. \nBio: Kwabena was born in Ghana\, West Africa. He moved to the US in 2004 for his undergraduate studies in Chemistry at Calvin College\, MI\, graduating with honors in 2008. After a year working at UOP Honeywell in IL where he researched new catalysts for the petrochemical and gas processing industries\, he traveled from the Midwest to the East Coast to begin his graduate studies in Inorganic Chemistry with Prof. Daniel Nocera at MIT (and later Harvard University). His graduate research focused on structural and mechanistic studies of water splitting electrocatalysis at cobalt and nickel compounds. After receiving his Ph.D. in 2015 from Harvard University\, Kwabena began postdoctoral work in Prof. Philip Kim’s group in the Department of Physics at Harvard\, where he studied ion intercalation and quantum transport in 2D van der Waals heterostructures. In July 2018\, Kwabena joined the faculty of the UC Berkeley Department of Chemistry. Awards received include: AFOSR Young Investigator award\, ONR Young investigator award\, DOE Early Career Award\, Gordon and Betty Moore Materials Synthesis Fellow\, and CIFAR–Azrieli Global Scholar.
URL:https://qmi.miffanytark.com/event/kwabena-bediako-new-twists-on-chemistry-and-physics-in-moire-superlattices/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220324T100000
DTEND;TZID=America/Vancouver:20220324T110000
DTSTAMP:20220316T183214Z
CREATED:20220316T183214Z
LAST-MODIFIED:20220316T183214Z
UID:4171-1648116000-1648119600@qmi.miffanytark.com
SUMMARY:Marlou Slot: Atom by Atom and Layer by Layer: Designing and Realizing Electronic Quantum Matter
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\n \nSpeaker: Marlou Slot; National Institute of Standards and Technology (NIST) – Gaithersburg\, Maryland\, United States \nTitle: Atom by Atom and Layer by Layer: Designing and Realizing Electronic Quantum Matter \nAbstract: Quantum simulators are a versatile tool to study the behavior of quantum matter in a controlled way. Elusive or complex quantum systems are simulated using accessible quantum systems that can be manipulated at will. While platforms based on\, among others\, ultracold atoms and photons are well-established\, electronic platforms are currently being developed.\nThe scanning tunneling microscope (STM) is uniquely suited to create and manipulate electronic 2D potential landscapes at will in-situ. By atomic-scale patterning of the 2D electron gas at specific metal surfaces\, the electrons can be molded into electronic lattices with nearly any geometry. In this talk\, I will present CO molecules adsorbed on a Cu(111) surface as a highly-tunable electronic quantum simulator\, in which the lattice geometry\, the orbital degree of freedom\, the dimension and the topology can be tailored [1-4]. Moving beyond the in-situ approach\, ex-situ nanofabricated twisted van der Waals devices pave the way to study electron-electron interactions in tailor-made 2D potential landscapes [5]. I will demonstrate high-resolution gate-tunable Landau level spectroscopy and signatures of correlated states in twisted double bilayer graphene\, expanding the quantum simulation toolkit from atom by atom to layer by layer. \n[1] M. R. Slot et al.\, Nat. Phys. 13\, 672 (2017)\n[2] S. N. Kempkes and M. R. Slot et al.\, Design and characterization of electrons in a fractal geometry\, Nat. Phys. 15\, 127 (2019)\n[3] M. R. Slot and S. N. Kempkes et al.\, p-Band Engineering in Artificial Electronic Lattices\, PRX 9\, 011009 (2019)\n[4] S. N. Kempkes and M. R. Slot et al.\, Robust zero-energy modes in an electronic higher-order topological insulator\, Nat. Mater. 18\, 1292 (2019)\n[5] D.M. Kennes et al.\, Moiré heterostructures as a condensed-matter quantum simulator\, Nat. Phys. 17\, 155 (2021) \nBio: Marlou Slot is a Rubicon Postdoctoral Fellow and NIST-Georgetown PREP Fellow working with Dr. Joseph Stroscio at the National Institute of Standards and Technology. She obtained her PhD from Utrecht University working with Prof. Daniel Vanmaekelbergh and Prof. Ingmar Swart. Prior to that\, she obtained her undergraduate degree from RWTH Aachen University and EPFL Lausanne and she was a research assistant at Forschungszentrum Jülich. Her research interests focus on designer quantum matter realized and/or measured using scanning probe microscopy\, including van der Waals heterostructures and in-situ patterned surfaces.
URL:https://qmi.miffanytark.com/event/marlou-slot-atom-by-atom-and-layer-by-layer-designing-and-realizing-electronic-quantum-matter/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220317T100000
DTEND;TZID=America/Vancouver:20220317T110000
DTSTAMP:20220309T185436Z
CREATED:20220309T185436Z
LAST-MODIFIED:20220309T185436Z
UID:4165-1647511200-1647514800@qmi.miffanytark.com
SUMMARY:Alexandra Navrotsky: Recent Developments in High Temperature Calorimetry
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\nSpeaker: Alexandra Navrotsky – Center for Materials of the Universe (MotU) \, Arizona State University \nTitle: Recent developments in high temperature calorimetry \nAbstract: A variety of high temperature calorimetric techniques have recently advanced for application to refractory oxides and related materials. These include improvements in oxide melt solution calorimetry at temperatures up to 1500 ⁰C\, differential thermal analysis to 2500 ⁰C\, and “drop-n-catch” calorimetry to 3000 ⁰C. Used together\, these methods enable one to draw a more complete picture of phase stability\, order-disorder\, melting and crystallization\, and dissolution of solids in silicate melts. These methods will be illustrated using examples from rare earth materials chemistry. New developments in the calorimetry of chalcogenides and mixed anion materials will also be presented. The synergy among calorimetry\, first principles calculations and computations of phase diagrams will be emphasized. \nBio: Alexandra Navrotsky – Professor\, School of Molecular Sciences and School for Engineering of Matter\, Transport and Energy \nAffiliated Faculty Member\, School of Earth and Space Exploration \nDirector\, Center for Materials of the Universe
URL:https://qmi.miffanytark.com/event/alexandra-navrotsky-recent-developments-in-high-temperature-calorimetry/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220310T100000
DTEND;TZID=America/Vancouver:20220310T110000
DTSTAMP:20220302T215953Z
CREATED:20220302T215953Z
LAST-MODIFIED:20220302T215953Z
UID:4155-1646906400-1646910000@qmi.miffanytark.com
SUMMARY:Inna Vishik: Electronic Correlations and Topology across Tc in a Magnetic Weyl Semimetal
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\nSpeaker: Inna Vishik\, Associate Professor in Physics and Astronomy at UC Davis \nAbstract: Co3Sn2S2 is a magnetic Weyl semimetal below its Curie temperature (Tc) of 177K. I will discuss our recent spatial and temperature-dependent angle-resolved photoemission spectroscopy (ARPES) studies in this system.  Across Tc\, we observe signatures of a topological phase transition\, but also observe changes in bulk bands which are inconsistent with a simple lifting of exchange interactions\, suggesting enhanced electronic correlations in the regime without long-range magnetic order.  I will also discuss spatial-dependent microARPES data which quantify the characteristic differences between Sn- and S- terminated surfaces. \nRef: Rossi\, Ivanov\, et al\, PRB 104\, 155115 (2021) \nBio:  Inna Vishik is an Associate Professor in Physics and Astronomy at UC Davis.  Since 2016\, her lab has been performing ARPES and ultrafast optics experiments to elucidate emergent phenomena in superconducting\, correlated\, and topological quantum materials.  Prior to this\, she received her PhD at Stanford and was subsequently a Pappalardo Postdoctoral fellow at MIT.
URL:https://qmi.miffanytark.com/event/inna-vishik-electronic-correlations-and-topology-across-tc-in-a-magnetic-weyl-semimetal/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220303T100000
DTEND;TZID=America/Vancouver:20220303T230000
DTSTAMP:20220228T230022Z
CREATED:20220228T230022Z
LAST-MODIFIED:20220228T230022Z
UID:4148-1646301600-1646348400@qmi.miffanytark.com
SUMMARY:Ke Zou: Recent progress on understanding the superconductivity of bulk and monolayer FeSe
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961\nPasscode: 113399 \n\nSpeaker: Ke Zou\, Stewart Blusson Quantum Matter Institute \nAbstract: \nThe physics of high-temperature superconductors is usually governed by the interplay of the spin and charge degrees of freedom. FeSe has the simplest chemical composition among Fe-based superconductors\, yet monolayer FeSe on SrTiO3 substrate reports one of the highest superconducting transition temperatures. I will summarize the progress on understanding its superconductivity from my group and other groups in the recent couple of years. We will discuss the specific roles of charge transfer\, spin magnetic moment\, and phonon coupling in this system. \n\nF. Li\, I. Elfimov\, and G.A. Sawatzky\, “Modulation doping of the FeSe monolayer on SrTiO3”\, submitted (2022).\nC. Liu\, H. Shin\, A. Doll\, H.H. Kung\, R.P. Day\, B.A. Davidson\, J. Dreser\, G. Levy\, A. Damascelli\, C. Piamonteze\, and K. Zou\, “High-temperature superconductivity and robustness against magnetic polarization in monolayer FeSe on EuTiO3”\, npj Quantum Materials 6\, 85 (2021).\nC. Liu\, R.P. Day\, F. Li\, R.L. Roemer\, S. Zhdanovich\, S. Gorovikov\, T. Pedersen\, J. Jiang\, S. Lee\, M. Schneider\, D. Wong\, P. Dosanjh\, F.J. Walker\, C.H. Ahn\, G. Levy\, A. Damascelli\, G.A. Sawatzky\, and K. Zou\, “High-order replica bands in monolayer FeSe/SrTiO3 revealed by polarization-dependent photoemission spectroscopy”\, Nature Communications 12\, 4573 (2021).\n\nBio: Assistant Professor\, Department of Physics and Astronomy – SBQMI \n\n\n\n\n\n\nResearch Focus\nOur research interests are in the growth of complex oxide and chalcogenide films by molecular beam epitaxy and the studies of their properties and functions. We aim to achieve scientific and technological breakthroughs in new materials and new functional devices. We integrate molecular beam epitaxy synthesis with nanostructure fabrication and characterization techniques for physical and electronic structures\, to explore and control the generated properties in new materials and in new forms of materials\, such as in heterostructures and gated field-effect transistors.
URL:https://qmi.miffanytark.com/event/ke-zou-recent-progress-on-understanding-the-superconductivity-of-bulk-and-monolayer-fese/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220210T100000
DTEND;TZID=America/Vancouver:20220210T110000
DTSTAMP:20220131T181905Z
CREATED:20220131T181905Z
LAST-MODIFIED:20220131T181905Z
UID:4052-1644487200-1644490800@qmi.miffanytark.com
SUMMARY:Christian Schneider: Exciton-Polaritons and their condensates in microcavities loaded with atomically thin crystals
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961\nPasscode: 113399 \n\nSpeaker: Christian Schneider\, Institute of Physics\, University of Oldenburg \nMonolayer transition metal dichalcogenides (TMDC) have emerged as a new platform for studies of tightly bound excitons and many-body excitations in ultimately thin materials. Their giant dipole coupling to optical fields makes them very appealing for implementing novel photonic devices\, and for fundamental investigations in the framework of cavity quantum electrodynamics [1]. \nIn the regime of strong light-matter coupling between TMDC excitons and microcavity photons \,  the effect of bosonic condensation of becomes evident in the high-density regime [2]. I will  address the question on the emergence of long-range first-order spatial coherence\, via interferometric g(1)(t) measurements (Fig. 1c). I will finally discuss the emergence of coherence of exciton-polaritons in a trap at room temperature [3]. \n \nPolariton dispersion relation below (0.1 Pth\, panel a\, excitation laser at 1.671 eV) and above threshold (2Pth\, panel b). (c) Real space interference pattern produced in a Michelson interferometer\, with a zero delay between the two interfering paths\, and one retro-reflected image. \n[1] C. Schneider et al. Nature Commun. 9\, 2695 (2018). \n[2] C. Anton-Solanas\, et al. Nature Materials 1-7 (2021).
URL:https://qmi.miffanytark.com/event/christian-schneider-exciton-polaritons-and-their-condensates-in-microcavities-loaded-with-atomically-thin-crystals/
CATEGORIES:CM Seminar
ORGANIZER;CN="Kaho Saito":MAILTO:kaho.saito@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220203T100000
DTEND;TZID=America/Vancouver:20220203T110000
DTSTAMP:20220127T224446Z
CREATED:20220127T224446Z
LAST-MODIFIED:20220127T224446Z
UID:4048-1643882400-1643886000@qmi.miffanytark.com
SUMMARY:Eliška Greplová: Quantum Matter Meets Artificial Intelligence
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09 \nMeeting ID: 684 7017 3961\nPasscode: 113399 \n  \n\nSpeaker: Eliska Greplova\, Assistant professor at the Department of Quantum Nanoscience at Delft University of Technology \n  \nAbstract: The fields of condensed matter\, artificial intelligence and quantum computing have independently experienced a number of breakthroughs in the last decade. In this talk\, I am going provide an illustration of their mutually beneficial overlaps and emerging interdisciplinary applications. Specifically\, I am going to show how AI-motivated ansätze for quantum wave functions can help us solve complex problems in topological condensed matter physics. The emergent topological modes can in turn redefine a figure of merit for design of quantum devices – that\, to close the circle – give rise to challenging control problems that can be efficiently solved with the help of machine learning algorithms. \n  \nBio: Eliska is an assistant professor at Kavli Institute of Nanoscience\, Delft University of Technology\, Netherlands. She is leading Quantum Matter and AI group\, where she works at the boundary of quantum computing\, artificial intelligence and condensed matter physics. Prior to joining TU Delft\, Eliska completed her PhD at Aarhus University in Denmark and postdoctoral fellowship at ETH Zürich in Switzerland. Eliska is a member of World Economic Forum Global Future Council on Quantum Computing and co-founder of an open science platform Virtual Science Forum.
URL:https://qmi.miffanytark.com/event/eliska-greplova/
CATEGORIES:CM Seminar
ORGANIZER;CN="Kaho Saito":MAILTO:kaho.saito@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220127T100000
DTEND;TZID=America/Vancouver:20220127T110000
DTSTAMP:20220120T194754Z
CREATED:20220120T194754Z
LAST-MODIFIED:20220120T194754Z
UID:4020-1643277600-1643281200@qmi.miffanytark.com
SUMMARY:Jennifer Cano: Higher magic angles in twisted bilayer graphene and topological twistronics 
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961\nPasscode: 113399 \n  \n\nSpeaker: Jennifer Cano\, Assistant Professor at Stony Brook University \nTitle: Higher magic angles in twisted bilayer graphene and topological twistronics \n  \nBio: Jennifer Cano is an Assistant Professor at Stony Brook University and an Affiliate Associate Research Scientist at the Flatiron Institute. She earned a PhD in physics from the University of California\, Santa Barbara\, in 2015\, and was subsequently a postdoctoral fellow at the Princeton Center for Theoretical Science. Her research is focused on the classification and realization of topological phases of matter\, ranging from strongly correlated phases with fractionalized excitations to non-interacting topological band structures. \n  \nAbstract: We present recent analytical and numerical results on the chiral model of twisted bilayer graphene and introduce a new platform for twistronic devices on the surface of a topological insulator. In the first part of the talk\, we study the flat band wavefunctions of chiral twisted bilayer graphene at higher magic angles. We show that at higher magic angles\, the wavefunctions exhibit an increasing number of zeros\, resembling quantum Hall wavefunctions at higher Landau levels. Zeros of the same chirality cluster near the center of the moire unit cell\, causing an enhanced phase winding and circulating current. The wavefunctions at higher magic angles have signatures in scanning tunneling microscopy and orbital magnetization experiments. In the second half of the talk\, we investigate the fate of the surface Dirac cone of a three-dimensional topological insulator subject to a superlattice potential. Using a combination of diagrammatic perturbation theory\, lattice model simulations\, and ab initio calculations\, we report a dramatic renormalization of the surface Dirac cone velocity and the formation of gapless satellite Dirac cones. The latter can produce very flat bands that may be a fruitful place to searching for interaction-driven physics.
URL:https://qmi.miffanytark.com/event/jennifer-cano/
CATEGORIES:CM Seminar
ORGANIZER;CN="Kaho Saito":MAILTO:kaho.saito@ubc.ca
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