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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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DTSTART;TZID=America/Vancouver:20241212T100000
DTEND;TZID=America/Vancouver:20241212T230000
DTSTAMP:20240903T215551Z
CREATED:20240903T215551Z
LAST-MODIFIED:20240903T215551Z
UID:8075-1733997600-1734044400@qmi.miffanytark.com
SUMMARY:CM Seminar: Sebastian ten Haa\, Majorana bound states in artificial Kitaev chains\, Delft University of Technology
DESCRIPTION:Speaker: Sebastian ten Haaf\, Delft University of Technology \nTime: 10:00-11:00am \nLocation: BRIM 311 \n  \nTitle: “Majorana bound states in artificial Kitaev chains” \nAbstract: “The Kitaev chain model predicts the ability to engineer localized Majorana bound states: non-Abelian zero-energy excitations that are protected from local perturbations\, which can be utilized for realizing robust quantum computation schemes. Recent work on InSb nanowires demonstrated that the ingredients for a minimal Kitaev chain\, consisting of two sites\, can be engineered by coupling quantum dots (QDs) via two second-order processes: crossed Andreev reflection and elastic co-tunnelling. To open up the path to more complex experiments\, we implemented this system in a two-dimensional electron gas (2DEG). In this talk\, I will detail the theoretical background and our experimental implementation of the Kitaev chain in the InSbAs 2DEG platform. I will highlight recent results obtained on a chain consisting of three quantum dots\, where we find that the presence of zero energy modes on the outer QDs is correlated with a bulk excitation gap in the middle QD\, demonstrating key properties of the Kitaev chain.”
URL:https://qmi.miffanytark.com/event/cm-seminar-srijit-goswami-delft-university-of-technology/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20241205T100000
DTEND;TZID=America/Vancouver:20241205T110000
DTSTAMP:20240903T215433Z
CREATED:20240903T215433Z
LAST-MODIFIED:20240903T215433Z
UID:8073-1733392800-1733396400@qmi.miffanytark.com
SUMMARY:CM Seminar: Shuyun Zhou\, Tsinghua University
DESCRIPTION:Speaker: Shuyun Zhou\, Tsinghua University \nTime: 10:00-11:00am \nLocation: BRIM 311 \n  \nCM Seminars take place every Thursday morning at BRIM 311. More information about the talk and speaker becomes available closer to the event’s date—watch this space for more!
URL:https://qmi.miffanytark.com/event/cm-seminar-shuyun-zhou-tsinghua-university/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20241128T100000
DTEND;TZID=America/Vancouver:20241128T110000
DTSTAMP:20240903T220429Z
CREATED:20240903T220429Z
LAST-MODIFIED:20240903T220429Z
UID:8079-1732788000-1732791600@qmi.miffanytark.com
SUMMARY:CM Seminar: Measurement induced criticality in monitored quantum systems\, Ehud Altman\, University of California\, Berkeley
DESCRIPTION:Speaker: Ehud Altman\, University of California\, Berkeley \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Measurement induced criticality in monitored quantum systems \nAbstract: A novel aspect of recent experiments with quantum devices is that measurements can play an active role in preparing the state of the system\, not just in diagnosing it. Unlike unitary evolution\, the quantum collapse induced by local measurements can have a highly non-local impact on entangled quantum states\, instantaneously destroying or creating new long distance correlations. I will review the surprising collective effects that can arise\, such as measurement induced phase transitions and new entanglement structures.  There is\, however\, a fundamental challenge to observing post-measurement correlations\, conditioned on the outcome of many-measurements with exponentially small Born probability of recurring. I will discuss how to resolve this post-selection problem by cross-correlating experimental data with results of an approximate classical model. This allows us to reframe the measurement induced transition as a transition in the ability of a classical intelligent agent to learn the quantum state.  \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-ehud-altman-university-of-california-berkeley/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20241121T100000
DTEND;TZID=America/Vancouver:20241121T110000
DTSTAMP:20241105T212444Z
CREATED:20241105T212444Z
LAST-MODIFIED:20241105T212444Z
UID:8217-1732183200-1732186800@qmi.miffanytark.com
SUMMARY:CM Seminar: Topological qubits from fractional quantum spin Hall states\, Drew Potter\, UBC
DESCRIPTION:Speaker: Drew Potter\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Topological qubits from fractional quantum spin Hall states  \nAbstract: The recent experiments have shown evidence for a fractional quantum spin Hall (FQSH) state in twisted MoTe2 bilayers. In this talk I will review these experiments\, survey some theoretical scenarios for candidate abelian and non-abelian FQSH orders. I will also describe a possible route towards building a topological quantum memory by interfacing FQSH states with superconductors\, and propose an all-electrical scheme to detect their topological ground-space degeneracy.
URL:https://qmi.miffanytark.com/event/cm-seminar-topological-qubits-from-fractional-quantum-spin-hall-states-drew-potter-ubc/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20241031T100000
DTEND;TZID=America/Vancouver:20241031T110000
DTSTAMP:20240903T215321Z
CREATED:20240903T215321Z
LAST-MODIFIED:20240903T215321Z
UID:8071-1730368800-1730372400@qmi.miffanytark.com
SUMMARY:CM Seminar: Efficient microwave-optical conversion mediated by color centers in silicon\, Mohammad Khalifa\, UBC
DESCRIPTION:Speaker: Mohammad Khalifa\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Quantum networks are expected to boost the quantum technology by enabling distributed quantum computing and quantum communication. A coherent converter between microwave and optical photons could enable the creation of these quantum networks where quantum information is locally processed in the microwave regime and distributed by optical photons. I will talk about the general requirements and challenges of building a microwave-optical converter with high conversion efficiency. Then\, I will introduce our proposed magneto-optic converter\, which is based on the effective nonlinearity of an ensemble of spin-bearing color centers implanted in silicon photonic resonator and coupled to a superconducting cavity. I will discuss the physics of the system and how it can be engineered to achieve near-unity conversion efficiency.
URL:https://qmi.miffanytark.com/event/cm-seminar-mohammad-khalifa-ubc/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20241024T100000
DTEND;TZID=America/Vancouver:20241024T110000
DTSTAMP:20241013T232106Z
CREATED:20241013T232106Z
LAST-MODIFIED:20241013T232106Z
UID:8211-1729764000-1729767600@qmi.miffanytark.com
SUMMARY:CM Seminar: Advanced LIGO: building a new window to the universe with quantum matter\, Jess McIver\, UBC.
DESCRIPTION:Speaker: Jess McIver\, UBC. \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Have you ever wondered how the Advanced LIGO detectors can sense relative displacements more than 1\,000 times smaller than the width of a proton? This unprecedented sensitivity is enabled in part by thin film technology! In this talk\, we’ll tour the Advanced LIGO detectors to get a sense for how we can detect gravitational waves with laser interferometers. We’ll summarize the performance of today’s gravitational-wave detectors and what we’ve learned about the Universe with gravitational waves so far. Finally\, we’ll discuss the pivotal role of material science advances in developing future gravitational-wave detectors and unlocking the invisible Universe.
URL:https://qmi.miffanytark.com/event/cm-seminar-advanced-ligo-building-a-new-window-to-the-universe-with-quantum-matter-jess-mciver-ubc/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20241017T100000
DTEND;TZID=America/Vancouver:20241017T110000
DTSTAMP:20240903T215136Z
CREATED:20240903T215136Z
LAST-MODIFIED:20240903T215136Z
UID:8069-1729159200-1729162800@qmi.miffanytark.com
SUMMARY:CM Seminar: Quantum Sensation: a journey through arts and quantum physics\, Catherine Deletoille\, Quantum Studio
DESCRIPTION:Speaker: Catherine Deletoille\, Quantum Studio Artist from Paris\, France   \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Quantum Sensation: a journey through arts and quantum physics \nAbstract: After a presentation of her artistic path and research\, the painter Caroline Delétoille will share some insights about the “quantum sensation” art-science project embedded at the core of her upcoming residency. This research-creation based exhibition has been developed since the end of 2023 in close collaboration with a physicist and a philosopher. Its artistic creation and exploration will continue during the residency at the QMI laboratories.
URL:https://qmi.miffanytark.com/event/cm-seminar-catherine-deletoille/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20241010T100000
DTEND;TZID=America/Vancouver:20241010T110000
DTSTAMP:20240917T154327Z
CREATED:20240917T154327Z
LAST-MODIFIED:20240917T154327Z
UID:8143-1728554400-1728558000@qmi.miffanytark.com
SUMMARY:CM Seminar: Atomic Cluster Expansion for "Learning" Many-Body Interaction\, Christoph Ortner\, UBC
DESCRIPTION:Speaker: Christoph Ortner\, UBC. \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Atomic Cluster Expansion for “Learning” Many-Body Interaction \nAbstract: The integration of machine learning (ML) into the traditional modeling workflows is replacing decades-old – often ad hoc – approximations (e.g.\, in constitutive laws) leading to new models that far outstrip their predecessors in accuracy and transferability. ”Pure” ML approaches are rarely successful but remarkable results can be achieved when integrated with domain knowledge. I will introduce a general formalism\, the Atomic Cluster Expansion\, for parameterizing many-body interaction and how it can be used for reduced-order modelling. Examples are taken from interatomic potentials\, coarse-grained MD\, and VMC.
URL:https://qmi.miffanytark.com/event/cm-seminar-atomic-cluster-expansion-for-learning-many-body-interaction-christoph-ortner-ubc/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20241003T100000
DTEND;TZID=America/Vancouver:20241003T110000
DTSTAMP:20240903T214840Z
CREATED:20240903T214840Z
LAST-MODIFIED:20240903T214840Z
UID:8066-1727949600-1727953200@qmi.miffanytark.com
SUMMARY:CM Seminar: Rogerio de Sousa\, University of Victoria
DESCRIPTION:Speaker: Rogerio de Sousa\, University of Victoria \nTime: 10:00-11:00am \nLocation: BRIM 311 \n  \nCM Seminars take place every Thursday morning at BRIM 311. More information about the talk and speaker becomes available closer to the event’s date—watch this space for more!
URL:https://qmi.miffanytark.com/event/cm-seminar-rogerio-de-sousa-university-of-victoria/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240926T100000
DTEND;TZID=America/Vancouver:20240926T110000
DTSTAMP:20240903T214733Z
CREATED:20240903T214733Z
LAST-MODIFIED:20240903T214733Z
UID:8063-1727344800-1727348400@qmi.miffanytark.com
SUMMARY:CM Seminar:  Impact of Josephson junction materials on the performance of superconducting qubits\, Josh Mutus\, Rigetti Computing
DESCRIPTION:Speaker: Josh Mutus\, Rigetti Computing \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Impact of Josephson junction materials on the performance of superconducting qubits \nAbstract: Superconducting qubits are a leading modality for quantum computing\, offering a favorable balance between coherence\, gate times\, scalability\, and fidelity. I will explore the interplay between materials science and qubit performance\, with a particular focus on how the materials used in Josephson junctions (JJs) affect qubit behavior. The frequency of a qubit is largely determined by the properties of JJs\, which typically consist of amorphous oxide tunnel barriers. These barriers are also the likely location of most two-level systems (TLS) defects. Recently\, we discovered an Alternating-Bias Assisted Annealing (ABAA) process that enables us to fine-tune JJs to achieve the desired frequency. Characterizing these ABAA post-processed JJs provides insight into the structural and chemical bonding uniformity of the amorphous oxides after ABAA processing\, as well as the impact on qubit performance and TLS density.
URL:https://qmi.miffanytark.com/event/cm-seminar-josh-mutus-rigetti-computing/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240919T100000
DTEND;TZID=America/Vancouver:20240919T110000
DTSTAMP:20240903T214247Z
CREATED:20240903T214247Z
LAST-MODIFIED:20240903T214247Z
UID:8060-1726740000-1726743600@qmi.miffanytark.com
SUMMARY:CM Seminar: Quantum Anomalous Hall Effects in Rhombohedral Graphene Moiré Structures \, Adarsh Patri\, UBC
DESCRIPTION:Speaker: Adarsh Patri\, UBC. \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Quantum Anomalous Hall Effects in Rhombohedral Graphene Moiré Structures  \nAbstract: A recent series of experiments in two-dimensional moiré materials have discovered the physics of quantum Hall effect in the absence of an external magnetic field. These so-called “(Integer/Fractional) Quantum Anomalous Hall” phases have been observed in twisted transition metal dichalcogenide MoTe2 moiré heterostructure\, as well as more recently in pentalayer rhombohedral graphene aligned with a hexagonal Boron-Nitride (hBN) substrate. Unlike the standard theoretical framework of the quantum Hall effect\, where one has a flat band at the single-particle level\, these discoveries provide a fertile ground for exploring the minimal conditions that are required to realize and stabilize such exotic phases of matter. In this talk\, I will examine the microscopic origin of both the integer and fractional QAH phases in N-layer graphene aligned with hBN through a combination of Hartree-Fock methods and Exact Diagonalization. I will also discuss the delicate role of the moiré superlattice potential in determining the ultimate ground state in strongly-correlated two-dimensional moiré materials. Time-permitting\, I will also briefly touch on the phenomenology of the recently observed extended quantum anomalous Hall effect in pentalayer graphene aligned with hBN. \nBio: Adarsh completed his undergraduate degree at the University of Waterloo\, and his PhD at the University of Toronto under the supervision of Yong-Baek Kim in 2021. He was a postdoctoral research associate from 2021—2024 at the Massachusetts Institute of Technology working with Senthil Todadri.
URL:https://qmi.miffanytark.com/event/cm-seminar-adarash-patri-ubc/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240912T100000
DTEND;TZID=America/Vancouver:20240912T110000
DTSTAMP:20240829T221720Z
CREATED:20240829T221720Z
LAST-MODIFIED:20240829T221720Z
UID:8011-1726135200-1726138800@qmi.miffanytark.com
SUMMARY:CM Seminar: Ziliang Ye\, Sliding Ferroelectricity in Rhombohedral MoS2: A New Approach to Nonvolatilely Switch the Interaction between Light and Matter
DESCRIPTION:Location: BRIM 311 \nTime: 10:00 AM – 11:00 AM \nAbstract: The tunability in the stacking of layered materials with van der Waals bonding provides a new and powerful approach to engineer their physical properties. Sliding ferroelectricity is one such example where an electric field drives one layer of materials to move relative to its neighbours due to an out-of-plane electric polarization arising from interlayer coupling. Sliding ferroelectricity can therefore occur in traditionally non-ferroelectric materials and has been observed in artificially stacked boron nitrides and transition metal dichalcogenides (TMDs). In this talk\, I will show that such a hysteric phenomenon can occur in chemically synthesized rhombohedral molybdenum disulfide (3R-MoS2) crystals with pre-existing domain walls. I will first discuss our studies on domain characterization using photocurrent and scanning probe microscopy. I will then show that these polarization domains and their switching behavior can be probed by optical spectroscopy\, revealing the existence of a variety of switching pathways. Due to their strong excitonic effects and sliding ferroelectricity\, rhombohedral TMDs can be built into nonvolatile optical memories with high performances. \nSpeaker: Ziliang Ye\, Associate Professor and Principal Investigator\, Stewart Blusson Quantum Matter Institute
URL:https://qmi.miffanytark.com/event/cm-seminar-ziliang-ye-ferroelectric-switching-of-light-matter-interactions-in-rhombohedral-mos2/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240905T100000
DTEND;TZID=America/Vancouver:20240905T100000
DTSTAMP:20240829T193256Z
CREATED:20240829T193256Z
LAST-MODIFIED:20240829T193256Z
UID:8002-1725530400-1725530400@qmi.miffanytark.com
SUMMARY:CM Seminar: Quantum Skyrmion Hall Effect\, Ashley Cook
DESCRIPTION:Time: 10:00 AM – 11:00 AM \nLocation: BRIM 311 \nAbstract: A great variety of topological phases have been classified as a consequence of discovery of the quantum Hall effect\, but this work has recently led to discovery of some topologically non-trivial phases of matter\, which contradict key assumptions of established classification schemes. These phases\, which are the topological skyrmion phases of matter\, multiplicative topological phases of matter\, and finite-size topological phases of matter\, necessitate a paradigm shift from the quantum Hall effect framework to that of the quantum skyrmion Hall effect\, in which the point charges of the quantum Hall effect are generalised to compactified p-branes. For compactification via fuzzification\, these compactified p-branes carrying charge are necessarily expressed in terms of angular momentum as quantum skyrmions. Ostensibly (d+1)-dimensional systems\, based on the number of Cartesian coordinates they possess\, can then in fact have D additional dimensions encoded in (pseudo)spin degrees of freedom\, and realize intrinsically (D+d+1)-dimensional topological states\, a finding supported by results in lattice tight-binding models. \nBio: Ashley Cook\, Group Leader\, Max Planck\, Dresden \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-ashley-cook/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240328T100000
DTEND;TZID=America/Vancouver:20240328T110000
DTSTAMP:20240325T203553Z
CREATED:20240325T203553Z
LAST-MODIFIED:20240325T203553Z
UID:7248-1711620000-1711623600@qmi.miffanytark.com
SUMMARY:CM Seminar: John Sous – University of California San Diego: Principles for phonon-driven energy solutions in functional electronic materials
DESCRIPTION:CM Seminar: John Sous – University of California San Diego\nTitle: Principles for phonon-driven energy solutions in functional electronic materials \nAbstract: Functional electronic materials are compounds in which correlations amongst electrons and between electrons and ionic vibrations (phonons) give rise to promising new functionalities poised to revolutionize energy conversion\, storage and sustainability. In this talk\, I will present principles – that extend the textbook understanding of electron-phonon coupling –  for the design of phonon-driven pathways to electronic materials with energy capabilities\, thereby opening a door to new advancements in the materials and energy sciences. I will discuss three examples: 1. Energy conversion in so-called polaronic crystals such as the organic oligo-acene molecules\, where I will show that the concept of a polaron becomes very quickly ill-defined as temperature increases from zero\, implying that energy absorption and conversion cannot be understood in terms of quasiparticle transport\, with ramifications to emerging solar cell technologies. 2. Energy storage in nanoscale materials whose phonons are initially excited by a light pulse\, where I will show that the excited phonons relax by releasing their excess energy into the electrons\, reshaping their correlations to form novel excited-state non-equilibrium phases such as the light-induced conversion of metals into disordered insulators and (near) superconductors which appear to be immune to thermalization on long timescales\, thus serving as new mediums for protected energy storage and utilization. 3. Energy sustainability from vibrationally coupled electrons in multiorbital electronic materials\, where I will show that phonons mediate superfluidity of light-mass\, small-size bipolarons with a critical transition temperature Tc whose value vastly surpasses widely assumed empirical upper bounds and which I am currently investigating in a number of emerging materials such as the newly synthesized organic terphenyl-based compounds\, SrTiO3\, LiTi2O4\, as well as twisted bilayer graphene moire heterostructures. I will conclude by providing an overview of my future plans. \nSpeaker Bio: John Sous is an Assistant Professor at the University of California\, San Diego (UCSD).  Prior to that he was a Gordon & Betty Moore Postdoctoral Fellow at Stanford University (2022 – 2023)\, before which he was a Materials Research Science and Engineering Center (MRSEC) Postdoctoral Fellow at Columbia University (2019 – 2022). He obtained a Ph.D. in Physics from the University of British Columbia (UBC) in 2019 and a M.Sc. in Chemical Physics from the University of Waterloo in 2013. His research focuses on the study of materials in which quantum correlations act to stabilize novel electronic states of matter with functionalities which can be useful in applied research\, such as energy applications. \n  \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-john-sous-university-of-california-san-diego-principles-for-phonon-driven-energy-solutions-in-functional-electronic-materials/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240321T100000
DTEND;TZID=America/Vancouver:20240321T110000
DTSTAMP:20240214T191126Z
CREATED:20240214T191126Z
LAST-MODIFIED:20240214T191126Z
UID:7089-1711015200-1711018800@qmi.miffanytark.com
SUMMARY:CM Seminar: Janez Bonca – University of Ljubljana: Equilibrium and far-from-equilibrium properties of bipolaron coupled to dispersive phonons
DESCRIPTION:CM Seminar: Janez Bonca – University of Ljubljana\nTitle: Equilibrium and far-from-equilibrium properties of bipolaron coupled to  dispersive phonons \nAbstract: In the first part of my talk\, I will discuss  a Holstein-like model with two electrons nonlinearly coupled to quantum phonons. Using an efficient method based on full quantum approach [1-4] we  simulate the dynamical response of a system subject to a short spatially uniform optical pulse that couples to dipole-active vibrational modes. Nonlinear electron-phonon coupling can either soften or strengthen the phonon frequency in the presence of electron density [5]. When two electrons are free to propagate on a lattice subject to non-linear coupling to phonons that soften phonon frequency\, an external optical pulse with well tuned frequency can induce attraction between electrons. Electrons remain bound long after the optical pulse is switched off. Changing the frequency of the pulse the attractive electron–electron interaction can be switched to repulsive. Two sequential optical pulses with different frequencies can switch between attractive and repulsive interaction [6]. \nIn the second part\, I will discuss the phase diagram of the bipolaron in the Holstein – Hubbard model in the presence of dispersive phonons. We show that a finite dispersion can stabilize a bound bipolaron even at large Coulomb repulsion U [7]. The sign of the curvature of the optical phonon dispersion plays a decisive role on the bipolaron binding energy and the effective mass in the presence of  U. Finally\, I will discuss the influence of U on the ARPES spectral function of the bipolaron. \nSpeaker Bio: Janez Bonca is a Professor and Dean of the Faculty of Mathematics and Physics at the University of Ljubljana\, Slovenia.  His research interests include theory of incommensurate systems\, theory of strongly correlated systems and high temperature superconductors\, theory of heavy fermion systems\, theory of mesoscopic systems and quantum dots\, theory of frustrated spin systems\, physics of electron – phonon interaction and theory of polarons and bipolarons\, study of systems driven far from equilibrium\, thermalization in many-body systems\, theory of many-body localization. Prof. Bonca completed his PhD from the University of Ljubljana\, and worked as a Post-doctoral Associate at  Los Alamos National Laboratory from 1992-1995. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-janez-bonca-university-of-ljubljana-equilibrium-and-far-from-equilibrium-properties-of-bipolaron-coupled-to-dispersive-phonons/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240314T100000
DTEND;TZID=America/Vancouver:20240314T110000
DTSTAMP:20240228T194842Z
CREATED:20240228T194842Z
LAST-MODIFIED:20240228T194842Z
UID:7121-1710410400-1710414000@qmi.miffanytark.com
SUMMARY:CM Seminar: Kamran Kamiri – National Centre for Nuclear Research\, Poland: Multiscale Modeling of Mechanical Deformation in Chemically Complex Alloys
DESCRIPTION:Kamran Kamiri – National Centre for Nuclear Research\, Poland\nTitle: Multiscale Modeling of Mechanical Deformation in Chemically Complex Alloys \nAbstract: In my presentation\, I will give an overview of three primary areas that have been my focal research interests at NOMATEN CoE: i) crystal and amorphous plasticity\, ii) transport properties of high-entropy alloys (HEAs)\, and iii) micro-structural informatics. In i)\, my research has employed statistical physics to unravel the microscopic basis of plasticity based on the collective dynamics of shear transformation zones in amorphous solids as well as dislocations mechanics in crystalline metals. Within the context of HEAs\, my focus has been on the role of chemical complexities (i.e. local disorder/ordering) investigating their impact on alloy strengths. In ii)\, I have explored the sluggish diffusion of defects in HEAs and its impact on thermo-mechanical properties. In the area of micro-structural informatics in iii)\, I have utilized the power of machine learning (ML) and graph neural networks GNNs to infer (hardness) properties solely based on the (surface) microstructural information. Building upon these achievements\, we are currently expanding the scope of the above studies by i) employing ML to identify relevant microstructural metrics for predicting bulk plastic properties in bulk metallic glasses as well as HEAs within the microstructure-property paradigm\, ii) utilizing machine-learned interatomic potentials for accelerated material discovery\, and iii) extending the GNN’s capabilities to infer microstructural signatures and defects based on micro/nano mechanical response (as input data) in different metallic systems and distinct alloy compositions. \nSpeaker Bio: Kamran Karimi is a computational materials physicist working at the National Centre for Nuclear Research\, Otwock Poland. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-kamran-kamiri-national-centre-for-nuclear-research-poland-multiscale-modeling-of-mechanical-deformation-in-chemically-complex-alloys/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240229T100000
DTEND;TZID=America/Vancouver:20240229T110000
DTSTAMP:20240214T190047Z
CREATED:20240214T190047Z
LAST-MODIFIED:20240214T190047Z
UID:7086-1709200800-1709204400@qmi.miffanytark.com
SUMMARY:CM Seminar: Ania Bleszynski Jayich – University of California Santa Barbara: Quantum sensing in the solid-state: from one spin to many spins
DESCRIPTION:CM Seminar: Ania Bleszynski Jayich – University of California Santa Barbara\nTitle: Quantum sensing in the solid-state: from one spin to many spins \nAbstract: Sensors that leverage quantum phenomena to measure physical quantities harbor many attractive features beyond classical sensors. Solid-state quantum sensors\, with the nitrogen-vacancy (NV) center in diamond a forefront technology\, are particularly attractive for their compatibility with biological and condensed matter systems\, offering ultra-high spatial resolution and sensitivity over a wide temperature range\, while being quantitative and non-invasive. Here I first present our group’s work on NV-center-based scanned probe imaging of electron flow patterns in graphene\, revealing the presence of hydrodynamic electron flow. A frontier of quantum sensing is the utilization of entangled quantum sensors for metrological advantage\, a goal not yet realized in the solid-state. I also discuss our group’s progress towards realizing novel many-body states of entangled spins\, both diamond-based qubits and novel chemically-assembled molecular spin systems. \nSpeaker Bio: Ania Bleszynski Jayich is a professor of physics at the University of California Santa Barbara\, where she holds the Bruker Endowed Chair for Science and Engineering\, the Elings Endowed Chair for Quantum Science\, and is co-director of the Quantum Foundry\, an NSF Q-AMASE-I center. Her research interests include quantum assisted sensing and imaging on the nanoscale\, spin-coupled optomechanics\, and hybrid quantum systems for sensing and quantum information. Before coming to UCSB\, Ania was a postdoctoral researcher at Yale University\, and received her PhD in physics from Harvard in 2006 and a B.S. in physics and mathematical and computational science from Stanford in 2000. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-ania-bleszynski-jayich-university-of-california-santa-barbara-quantum-sensing-in-the-solid-state-from-one-spin-to-many-spins/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240215T100000
DTEND;TZID=America/Vancouver:20240215T110000
DTSTAMP:20240123T175412Z
CREATED:20240123T175412Z
LAST-MODIFIED:20240123T175412Z
UID:6853-1707991200-1707994800@qmi.miffanytark.com
SUMMARY:CM Seminar: James Analytis – UC Berkley: Frustrated Quantum Devices: understanding how correlations\, complex order and boundary states manifest in novel material functionalities
DESCRIPTION:CM Seminar: James Analytis – UC Berkley \nTitle: Frustrated Quantum Devices: understanding how correlations\, complex order and boundary states manifest in novel material functionalities \nAbstract: Materials at the boundary of critical phase transitions are of significant fundamental interest\, not least due because of their connection to unconventional superconductivity and quantum magnetism. One characteristic of such systems is the presence of coupled order parameters that underlie these phase transitions. Here\, we explore how this coupling manifests in the response of these materials when driven out of equilibrium by applied currents. We demonstrate how magnetic and charge textures can be electrically manipulated\, suggesting possible applications for exotic materials in spintronics technologies. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-james-analytis-uc-berkley-frustrated-quantum-devices-understanding-how-correlations-complex-order-and-boundary-states-manifest-in-novel-material-functionalities/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240208T100000
DTEND;TZID=America/Vancouver:20240208T110000
DTSTAMP:20240123T175112Z
CREATED:20240123T175112Z
LAST-MODIFIED:20240123T175112Z
UID:6851-1707386400-1707390000@qmi.miffanytark.com
SUMMARY:CM Seminar: James McIver– Columbia University: Ultrafast optoelectronic circuits
DESCRIPTION:CM Seminar: James McIver– Columbia University\nTitle: Ultrafast optoelectronic circuits \nAbstract: Ultrafast optoelectronic circuits offer new opportunities for investigating and controlling the electrical responses of microstructured quantum materials and heterostructures at femtosecond timescales and THz frequencies. Based on metal waveguides and laser-triggered photoconductive switches\, these chip-scale circuits can be interfaced to quantum materials to directly probe the ultrafast flow of electrical currents or perform near-field THz spectroscopy on length scales orders of magnitude smaller than the diffraction limit. \nIn this talk\, I will present on my group’s activities using these circuits to study the electrical transport properties of quantum materials driven out of equilibrium by femtosecond laser pulses [1]. In monolayer graphene\, we observe an anomalous Hall effect induced by circularly polarized light in the absence of an applied magnetic field [2]. The dependence of the effect on a gate potential used to tune the Fermi level reveals multiple features that reflect the formation of a photon-dressed\, or “Floquet-engineered”\, topological band structure. The results are a critical first step towards realizing and controlling light-induced topological edge states. I will also discuss our recent results on the Weyl semimetal Td-MoTe2\, where we observe rectified photocurrents that scale linearly with the applied laser field. This scaling violates the perturbative description of nonlinear optics/transport\, but can be explained by the formation of a photon-dressed magnetic Weyl semimetal state. \nIn the second part of my talk\, I will present on my group’s efforts in using femtosecond voltage pulses generated on-chip to probe and manipulate gate-tunable van der Waals heterostructures embedded in plasmonic cavities. We perform near-field time-domain THz spectroscopy on these cavities to study the light-matter hybridization. We observe coherent plasmon cavity modes that can be tuned from the weak to ultrastrong coupling regimes with electrostatic gating and cavity geometry. These techniques\, which we are extending to mK temperatures and strong magnetic fields\, could be used to investigate and control a wide range of topological and strongly correlated phenomena in microstructured quantum materials and heterostructures that fall on the THz/meV energy scale.
URL:https://qmi.miffanytark.com/event/cm-seminar-james-mciver-columbia-university/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240201T100000
DTEND;TZID=America/Vancouver:20240201T110000
DTSTAMP:20240130T212209Z
CREATED:20240130T212209Z
LAST-MODIFIED:20240130T212209Z
UID:6951-1706781600-1706785200@qmi.miffanytark.com
SUMMARY:CM Seminar: Hao Tjeng – Max Planck Institute: Stabilization of U 5f2 configuration in UTe2 through U 6d dimers in the presence of Te2 chains
DESCRIPTION:Hao Tjeng – Max Planck\nTitle: Stabilization of U 5f2 configuration in UTe2 through U 6d dimers in the presence of Te2 chains \nAbstract: We investigate the topological superconductor candidate UTe2 using high-resolution valence-band resonant inelastic x-ray scattering at the U M4\,5-edges. We observe atomic-like low-energy excitations that support the correlated nature of this unconventional superconductor. These excitations originate from the U 5f2 configuration\, which is unexpected since the short Te2-Te2 distances exclude Te2 being 2-. By utilizing the photoionization cross-section dependence of the photoemission spectra in combination with band structure calculations\, we infer that the stabilization of the U 5f2 configuration is due to the U 6d bonding states in the U-dimers acting as a charge reservoir. Our results emphasize that the description of the physical properties should commence with a 5f2 ansatz. \nSpeaker Bio: Prof. Tjeng has been Director and Scientifc member at the Max Planck Institute for Chemical Physics of Solids since October 2009. He is an experimental physicist and has previously been associated with the Royal Netherlands Academy of Sciences\, the Solid State Physics Laboratory\, University of Groningen\, The Netherlands\, and the University of Cologne\, Germany.
URL:https://qmi.miffanytark.com/event/cm-seminar-hao-tjeng-max-planck-institute-stabilization-of-u-5f2-configuration-in-ute2-through-u-6d-dimers-in-the-presence-of-te2-chains/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240125T100000
DTEND;TZID=America/Vancouver:20240125T110000
DTSTAMP:20240109T181429Z
CREATED:20240109T181429Z
LAST-MODIFIED:20240109T181429Z
UID:6808-1706176800-1706180400@qmi.miffanytark.com
SUMMARY:CM Seminar: Carlos Silva-Acuña – Université de Montréall: Many-Body Exciton Polariton Quantum Dynamics in Optical Microcavities based on two-dimensional Metal-Halide Semiconductors
DESCRIPTION:CM Seminar: Carlos Silva-Acuña – Institut Courtois & Département de physique\, Université de Montréal \nTitle: Many-Body Exciton Polariton Quantum Dynamics in Optical Microcavities based on two-dimensional Metal-Halide Semiconductors \nAbstract: Two-dimensional analogs of metal-halide perovskites represent a promising platform for exciton-polariton-based technologies. They sustain strongly bound excitons that are stable at room temperature\, readily enabling strong light-matter coupling at ambient conditions. In the strong coupling limit\, uncoupled excitons have been mainly regarded as a reservoir for the polariton population. In this work\, we posit that there is a bidirectional interplay between the uncoupled exciton dynamics and the polariton quantum dynamics. We fabricated a Fabry-Pérot microcavity\, enclosing a two-dimensional hybrid organic-inorganic lead-iodide semiconductor\, and resolved the multi-particle correlations of exciton-polaritons — that is their population and coherence dynamics — employing excitation correlation photoluminescence and two-dimensional coherent excitation spectroscopies. We find (i) an increased exciton bimolecular scattering rate of the exciton reservoir in the microcavity relative to the bare semiconductor; (ii) ultrafast population transfer from the uncoupled exciton states and the middle polariton to the lower polariton; and (iii) two-quantum correlations between polaritons and uncoupled excitons. Our work quantifies many-body correlations between bare excitons and exciton-polaritons\, which are fundamental in mechanisms of the formation of polariton condensates. \nSpeaker Bio: Carlos Silva-Acuña is the Director of the Courtois Institute and a Professor at the Department of Physics at Université de Montréal. \n  \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-carlos-silva-acuna-universite-de-montreal-many-body-exciton-polariton-quantum-dynamics-in-optical-microcavities-based-on-two-dimensional-metal-halide-semiconductors/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240110T110000
DTEND;TZID=America/Vancouver:20240110T120000
DTSTAMP:20240110T164032Z
CREATED:20240110T164032Z
LAST-MODIFIED:20240110T164032Z
UID:6810-1704884400-1704888000@qmi.miffanytark.com
SUMMARY:CM Seminar: Kaoru Yamanouchi – The University of Tokyo: Quantum computing of atomic and molecular problems
DESCRIPTION:Kaoru Yamanouchi – Institute for Attosecond Laser Facility and Department of Chemistry\, University of Tokyo \nTitle: Quantum computing of atomic and molecular problems \nAbstract: Two-dimensional analogs of metal-halide perovskites represent a promising platform for exciton-polariton-based technologies. They sustain strongly bound excitons that are stable at room temperature\, readily enabling strong light-matter coupling at ambient conditions. In the strong coupling limit\, uncoupled excitons have been mainly regarded as a reservoir for the polariton population. In this work\, we posit that there is a bidirectional interplay between the uncoupled exciton dynamics and the polariton quantum dynamics. We fabricated a Fabry-Pérot microcavity\, enclosing a two-dimensional hybrid organic-inorganic lead-iodide semiconductor\, and resolved the multi-particle correlations of exciton-polaritons — that is their population and coherence dynamics — employing excitation correlation photoluminescence and two-dimensional coherent excitation spectroscopies. We find (i) an increased exciton bimolecular scattering rate of the exciton reservoir in the microcavity relative to the bare semiconductor; (ii) ultrafast population transfer from the uncoupled exciton states and the middle polariton to the lower polariton; and (iii) two-quantum correlations between polaritons and uncoupled excitons. Our work quantifies many-body correlations between bare excitons and exciton-polaritons\, which are fundamental in mechanisms of the formation of polariton condensates. \nSpeaker Bio:Kaoru Yamanouchi  is the Director of the Institute for Attosecond Laser Facility at the University of Tokyo and a Professor at the Department of Chemistry at the University of Tokyo. His research is focused on intense laser field science\, attosecond science\, and quantum computing. \n  \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-kaoru-yamanouchi-the-university-of-tokyo-quantum-computing-of-atomic-and-molecular-problems/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20231207T100000
DTEND;TZID=America/Vancouver:20231207T110000
DTSTAMP:20231201T230526Z
CREATED:20231201T230526Z
LAST-MODIFIED:20231201T230526Z
UID:6749-1701943200-1701946800@qmi.miffanytark.com
SUMMARY:CM Seminar: Andrea Young – University of California Santa Barbara: Magnetism and superconductivity in rhombohedral graphene multilayers: triplet superconductivity\, intervalley coherence\, and spin orbit coupling 
DESCRIPTION:Andrea Young – University of California Santa Barbara\nTitle: Magnetism and superconductivity in rhombohedral graphene multilayers: triplet superconductivity\, intervalley coherence\, and spin orbit coupling  \nAbstract: The electronic band structure of rhombohedral graphene multilayers hosts van Hove singularities at which the single particle of states diverges.  I will discuss experiments in which we use electrostatic gates to tune the chemical potential through these singularities\, revealing a cascade of correlated electron phases; notably\, both singlet and triplet superconductors are observed proximal to or within generalized ferromagnetic phases where the system spontaneously polarizes into one or more of the spin- and valley isospin flavors. I will give an overview of this system\, and describe recent experiments that reveal the role of intrinsic spin orbit coupling in graphene. \nSpeaker Bio: Dr. Andrea Young is a professor of Physics at the University of California Santa Barbara. His lab\, the Young lab\, combines nanofabrication and electronic measurement techniques in order to investigate the properties of electronic states in quantum materials\, and is currently interested in the interplay between symmetry\, topology\, and correlations in low dimensional systems.
URL:https://qmi.miffanytark.com/event/cm-seminar-andrea-young-university-of-california-santa-barbara-magnetism-and-superconductivity-in-rhombohedral-graphene-multilayers-triplet-superconductivity-intervalley-coherence-and/
LOCATION:McLeod 3038\, 2356 Main Mall\, Vancouver\, British Columbia\, V6T 1Z3\, Canada
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20231130T100000
DTEND;TZID=America/Vancouver:20231130T110000
DTSTAMP:20231124T181128Z
CREATED:20231124T181128Z
LAST-MODIFIED:20231124T181128Z
UID:6713-1701338400-1701342000@qmi.miffanytark.com
SUMMARY:CM Seminar: Nitin Kaushal – QMI: Realization of magnetically frustrated Wigner crystals and a novel multiorbital model in transition metal dichalcogenide based moiré materials
DESCRIPTION:Nitin Kaushal – Quantum Matter Institute \nTitle: Realization of magnetically frustrated Wigner crystals and a novel multiorbital model in transition metal dichalcogenide based moiré materials \nAbstract: Moiré materials constructed using the transition metal dichalcogenide (TMD) bilayers have been used to simulate the Hubbard model with long range Coulomb interactions procuring the lattice Wigner crystal states at fractional fillings like n=2/3\, 1/2\, and 1/3. We study the gamma-valley TMD homobilayers which can give rise to the effective moire honeycomb lattices\, as shown by recent ab-initio studies. We discuss the effect of Coulomb interactions in these homobilayers unveiling the plethora of frustrated magnetic states on Wigner crystals at various fractional fillings\, which suggests the latent potential of these materials to realize quantum spin liquids. Moreover\, by performing Wannierization of the moiré bands we show that these materials can realize a more general moire Kanamori-Hubbard model\, opening an avenue for physics beyond the extensively studied multiorbital Hubbard model. \nSpeaker Bio: Dr. Nitin Kaushal is a postdoctoral fellow at the Quantum Matter Institute working with Professor Marcel Franz’s group. Prior to joining UBC\, he worked as a postdoctoral researcher at the Oak Ridge National Laboratory (2020-2023. Nitin completed his PhD at the University of Tennessee in 2020\, under the guidance of Prof. Elbio Dagotto. During his Ph.D.\, he investigated the effects of atomic spin-orbit coupling on the multi-orbital Hubbard models. In recent years\, Nitin’s research has been centered on moiré materials.
URL:https://qmi.miffanytark.com/event/cm-seminar-nitin-kaushal-qmi-realization-of-magnetically-frustrated-wigner-crystals-and-a-novel-multiorbital-model-in-transition-metal-dichalcogenide-based-moire-materials/
LOCATION:McLeod 3038\, 2356 Main Mall\, Vancouver\, British Columbia\, V6T 1Z3\, Canada
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20231123T100000
DTEND;TZID=America/Vancouver:20231123T110000
DTSTAMP:20231106T183834Z
CREATED:20231106T183834Z
LAST-MODIFIED:20231106T183834Z
UID:6627-1700733600-1700737200@qmi.miffanytark.com
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
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