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DTSTART;TZID=America/Vancouver:20250109T100000
DTEND;TZID=America/Vancouver:20250109T110000
DTSTAMP:20240903T220310Z
CREATED:20240903T220310Z
LAST-MODIFIED:20240903T220310Z
UID:8077-1736416800-1736420400@qmi.miffanytark.com
SUMMARY:CM Seminar: How nonlinearity distorts the evidence for photoinduced superconductivity\, J. Steven Dodge\, SFU
DESCRIPTION:Speaker: J. Steven Dodge\, SFU \nAbstract: How nonlinearity distorts the evidence for photoinduced superconductivity \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Over a decade of research has suggested that some metallic compounds can be transformed into superconductors by illuminating them with intense beams of laser light. Recently\, we have shown that the experimental evidence for this effect could literally be an optical illusion produced by the high-intensity laser illumination. By examining several influential results on photoinduced superconductivity in K3C60\, we have identified a fundamental flaw in their analysis that exaggerates the apparent photoinduced changes to the conductivity. When we account for this error\, we find evidence that photoexcitation produces a moderate enhancement of the conductivity\, but that there is no need to appeal to a photoinduced phase transition to a superconducting state. Subsequent work on K3C60 has provided quantitative support for our analysis. After discussing our reanalysis of experiments on K3C60\, I will describe how this error also distorts the evidence for photoinduced superconductivity in the normal state of cuprate superconductors and in the charge-transfer salt BEDT-TTF. Finally\, I will discuss how our reinterpretation raises new and interesting questions about the interaction of light with matter. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-j-steven-dodge-sfu/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
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:20240731T100000
DTEND;TZID=America/Vancouver:20240731T110000
DTSTAMP:20240719T155257Z
CREATED:20240719T155257Z
LAST-MODIFIED:20240719T155257Z
UID:7696-1722420000-1722423600@qmi.miffanytark.com
SUMMARY:Special Seminar: David Abergel – Chief Editor of Nature Physics: Inside Nature Physics
DESCRIPTION:Abstract: What happens to your paper after you submit it to a journal is not always clear from the outside\, but it’s helpful for authors to understand the editorial process so that they can navigate it smoothly. In this talk\, we will unpack this process and explain how editors make their decisions. We will introduce Nature Physics (and other journals in the Nature Portfolio) and describe how we see our role in the scientific community and what we are trying to achieve. Building on that\, we will discuss how we select papers for peer review based on the likely breadth of interest in the results that they contain\, and how we interpret the information in peer review reports in terms of technical and editorial concerns. We’ll also discuss some techniques for writing papers and leave plenty of time for questions and discussion. \nBio: Before joining Nature Physics in 2017\, David carried out theoretical research on graphene and other two-dimensional materials\, and topological materials. He completed a Ph.D at Lancaster University in 2007\, and then did post-doctoral work at the University of Manitoba (Canada) and the University of Maryland (USA) before undertaking an Assistant Professorship at Nordita\, the Nordic Institute for Theoretical Physics in Stockholm\, Sweden. David is based in Nature Physics’ Berlin office.
URL:https://qmi.miffanytark.com/event/special-seminar-david-abergel-chief-editor-of-nature-physics-inside-nature-physics/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240717T090000
DTEND;TZID=America/Vancouver:20240717T100000
DTSTAMP:20240716T230944Z
CREATED:20240716T230944Z
LAST-MODIFIED:20240716T230944Z
UID:7693-1721206800-1721210400@qmi.miffanytark.com
SUMMARY:Special Seminar: Wolf Widdra - Institute of Physics\, Martin-Luther-Universität Halle-Wittenberg: Laser-based double photoemission spectroscopy at surfaces
DESCRIPTION:Abstract: \nWith the recent progress in high-order harmonic generation (HHG) using femtosecond lasers\, laboratory photoelectron spectroscopy with an ultrafast\, widely tunable vacuum-ultraviolet light source has become available. Whereas HHG-based photoemission experiments at kilohertz repetition rates have been severely limited by the space-charge effects in the past\, the new development of compact HHG light sources with megahertz repetition rates allows for efficient photoemission and double photoemission experiments as is demonstrated here [1-7].\nI will present momentum-resolved photoemission experiments with photon energies between 14 and 40 eV that demonstrate the high performance of the setup [3\,4\,6]. In addition\, the combination of two time-of-flight spectrometers with coincidence detection electronics opens the way for efficient and long-term stable double photoemission experiments at variable photon energies [1\,6-8]. For the noble metal (001) surface of Ag\, we present a detailed analysis of double photoemission data and will compare them with similar data for the NiO(001) surface. The electron-electron pair distribution shows a sharp sum-energy onset\, which corresponds to one hole in the Ag 3d band (4.5 eV below the Fermi level) and a second excitation from the Ag sp band. Simultaneously\, an intense energy sharing between the electrons in the pair is visible indicating strong electron-electron correlations [5]. For thin films of C60\, a molecular-orbital resolved correlation energy is determined based on double photoemission data at various photon energies. \nReferences:\n[1]    M. Huth\, C.-T. Chiang\, A. Trützschler\, F. O. Schumann\, J. Kirschner\, and W. Widdra; Applied Physics Letters 104\, 061602 (2014).\n[2]    A. Blättermann\, C.-T. Chiang\, and W. Widdra; Physical Review A 89\, 043404 (2014).\n[3]    C.-T. Chiang\, M. Huth\, A. Trützschler\, M. Kiel\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, New Journal of Physics 17\, 013035 (2015).\n[4]    C.-T. Chiang\, M. Huth\, A. Trützschler\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, Electron Spectroscopy and Related Phenomena 200\, 15-21(2015).\n[5]     A. Trützschler\, M. Huth\, C.-T. Chiang\, R. Kamrla\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, Phys. Rev. Lett. 118\, 136401(2017).\n[6]    M. Huth\, A. Trützschler\, C.-T. Chiang\, R. Kamrla\, F. O. Schumann\, and W. Widdra\, J. Appl. Phys. 124\, 164504 (2018).\n[7]     C.-T. Chiang\, A. Trützschler\, M. Huth\, R. Kamrla\, F. O. Schumann\, and W. Widdra\, Prog. Surf. Sci. 95\, 100572 (2020). \n  \nSpeaker Bio: Prof. Wolf Widdra is a Professor at the the Institute of Physics\, Martin-Luther-Universität Halle-Wittenberg\, Halle\, Germany. \n 
URL:https://qmi.miffanytark.com/event/special-seminar-wolf-widdra-institute-of-physics-martin-luther-universitat-halle-wittenberg-laser-based-double-photoemission-spectroscopy-at-surfaces/
CATEGORIES:Other seminars,UBC event
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240703T100000
DTEND;TZID=America/Vancouver:20240703T110000
DTSTAMP:20240625T155827Z
CREATED:20240625T155827Z
LAST-MODIFIED:20240625T155827Z
UID:7660-1720000800-1720004400@qmi.miffanytark.com
SUMMARY:Special Seminar: Solids with random stacking: the curious case of lithium
DESCRIPTION:Abstract: Close-packing of spheres is a problem with a long\, beautiful history that spans centuries. To achieve maximal density\, we must first arrange spheres into triangular layers and stack them. Each layer can sit in two possible positions. I will describe the solid that arises from random stacking\, i.e.\, when each twofold choice is made at random. I will introduce a related problem — that of stacking spheres with the least possible density\, while retaining stability. The conjectured solution involves stacking honeycomb layers\, with a six-fold choice at each layer.  I will describe random stacking in this case as well. \nI will then present a decades-long puzzle: the low-temperature structure of lithium and sodium. Both have irregular structures with many conflicting claims. We propose an explanation that borrows ideas from the field of frustrated magnetism. Lithium and sodium form close-packed structures\, with stacked triangular layers. Due to a hidden gauge symmetry\, all stacking configurations have the same electronic energy. We have a ‘frustrated’ solid where an infinite family of crystal structures compete. \nReferences: Phys. Rev. E 108\, 035003 (2023)\,arXiv:2405.15865 \nSpeaker Bio: Ganesh Ramachandran obtained his PhD from the University of Toronto in 2011. He then completed a postdoctoral stint at IFW\, Dresden. Subsequently\, he was a faculty member at the Institute of Mathematical Sciences in Chennai\, India. Since 2021\, he has been an Assistant Professor at Brock University. \nProf. Ramachandran has worked on frustrated magnetism\, topological phases\, quantum state preparation and statistical physics. His recent work touches upon pump-induced correlations\, altermagnetism\, spin ice and quantum dimer models.
URL:https://qmi.miffanytark.com/event/special-seminar-solids-with-random-stacking-the-curious-case-of-lithium/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240619T100000
DTEND;TZID=America/Vancouver:20240619T110000
DTSTAMP:20240604T013837Z
CREATED:20240604T013837Z
LAST-MODIFIED:20240604T013837Z
UID:7591-1718791200-1718794800@qmi.miffanytark.com
SUMMARY:Quantum Computing: Building Bridges Between Academia\, Industry\, and Government
DESCRIPTION:In recent years\, quantum computing has made continuous progress from improvements in scalability to advancements in error correction codes. This has motivated an increasing focus on exploring use cases and applications. \nJoin us for this year’s second Unboxing Quantum panel\, where quantum industry experts and thought leaders will come together to discuss Canada’s rapidly evolving quantum computing landscape. Hosted by UBC’s Blusson Quantum Matter Institute (Blusson QMI)\, the online event will take place from 10:00 to 11:00 am (PT) on June 19\, 2024. \n \nWith a special focus on pathways to fostering collaboration between academia\, industry\, and government\, this panel aims to explore the critical role that universities and research institutes play in fostering adoption\, ushering in new technology\, and training the quantum workforce as we emerge from the noisy intermediate-scale quantum (NISQ) era and into the early stages of fault tolerance. \nSpeakers: \n\nLukas Chrostowski\, Investigator\, Blusson QMI\nLisa Lambert\, CEO\, Quantum Industry Canada\nAlex Challans\, CEO\, Resonance\nChristopher Coleman\, Postdoctoral Fellow\, Blusson QMI (Moderator)\n\nTo register for the event\, please click here.
URL:https://qmi.miffanytark.com/event/quantum-computing-building-bridges-between-academia-industry-and-government/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240612T080000
DTEND;TZID=America/Vancouver:20240613T170000
DTSTAMP:20240501T230655Z
CREATED:20240501T230655Z
LAST-MODIFIED:20240501T230655Z
UID:7418-1718179200-1718298000@qmi.miffanytark.com
SUMMARY:Dawn VII
DESCRIPTION:Every 2-3 years\, the community of physicists working with ground-based gravitational wave (GW) detectors holds a discussion-based “Dawn” meeting to plan for the future of the field.  \nThis year the global ground-based GW community (LIGO\, Virgo\, KAGRA\, Cosmic Explorer\, and Einstein Telescope) is coming to us: Blusson QMI is hosting the Dawn VII meeting June 12-13 in the Scarfe building. \nYou can find a program outline here: https://dawn7.phas.ubc.ca/program/ \nDawn VII will be a great introduction to challenges\, opportunities\, and relevant timescales for development of enabling technologies for ground-based GW detectors\, including thin-film mirror coatings (a critical need with a lot of overlapping expertise in QMI)\, large-scale substrates\, thermal effects\, sensor development\, and quantum squeezing.  \nThere will also be satellite workshops devoted to pursuing a needed breakthrough in thin-film coatings and GW detector technology on Friday June 14.  \nPlease register here!
URL:https://qmi.miffanytark.com/event/dawn-vii/
LOCATION:Neville Scarf\, 2125 Main Mall\, Vancouver\, British Columbia\, V6T 1Z4\, Canada
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240607T110000
DTEND;TZID=America/Vancouver:20240607T120000
DTSTAMP:20240524T192104Z
CREATED:20240524T192104Z
LAST-MODIFIED:20240524T192104Z
UID:7527-1717758000-1717761600@qmi.miffanytark.com
SUMMARY:Special Seminar: Rachel Wortis - Trent University: Many-body localization in the disordered Fermi-Hubbard model
DESCRIPTION:Title:  Many-body localization in the disordered Fermi-Hubbard model \nAbstract: How isolated quantum systems reach thermal equilibrium is a long-standing question of continuing interest. The absence of equilibration in some systems is also well known\, notably Anderson localization in noninteracting systems with quenched disorder.  However\, it has only relatively recently been understood that the absence of equilibration can persist in the presence of interactions\, dubbed many-body localization.  While most of the theoretical work in this area has focused on spin systems\, in which there is just one local degree of freedom\, systems with multiple coupled degrees of freedom are of interest\, not least because most experimental studies of many-body localization use cold atoms described by the Hubbard model.  This talk will review this context and explore the specific case of the disordered Fermi-Hubbard model.  With two coupled local degrees of freedom\, charge and spin\, how does disorder in one of these influence localization in the other?  Writing the Hamiltonian in terms of charge- and spin-specific integrals of motion\, we extract time scales associated with charge-charge\, spin-spin\, and charge-spin coupling and connect these with the growth of entanglement.
URL:https://qmi.miffanytark.com/event/special-seminar-rachel-wortis-trent-university-many-body-localization-in-the-disordered-fermi-hubbard-model/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240531T100000
DTEND;TZID=America/Vancouver:20240531T110000
DTSTAMP:20240524T231634Z
CREATED:20240524T231634Z
LAST-MODIFIED:20240524T231634Z
UID:7544-1717149600-1717153200@qmi.miffanytark.com
SUMMARY:Special Seminar: Owen Sheekey - UCSB: Inter-valley coherence\, intrinsic and extrinsic spin-orbit coupling in rhombohedral graphene
DESCRIPTION:Abstract: Rhombohedral graphene multilayers provide a clean and highly reproducible platform to explore the emergence of superconductivity and magnetism in a strongly interacting electron system. The high density of states near the van Hove singularities lead to a variety of broken symmetry phases – including exotic forms of spin and valley ferromagnetism [2\, 3]. Because of their combined spin and valley ‘isospin’ degrees of freedom\, these Stoner magnets exhibit an approximate SU(4) symmetry with a near degeneracy in the many body phase diagram. In reality\, this SU(4) symmetry is only approximate\, weak symmetry breaking arises even at the single particle level – in the form of intrinsic spin-orbit coupling. Here\, we use high resolution thermodynamic compressibility measurements and nanoSQUID on tip (nSOT) magnetometry to study the effects that intrinsic spin-orbit coupling has on the magnetic phase diagram in rhombohedral graphene. By supporting rhombohedral graphene on a WSe2 substrate\, ‘extrinsic’ strong spin-orbit coupling can be proximitized\, significantly altering the magnetic phase diagram. We demonstrate the presence of an inter-valley coherent quarter metal which becomes strongly spin-valley locked when supported by WSe2. Our results shed light on the role proximity induced Ising spin-orbit coupling and intrinsic spin-orbit coupling plays in selecting the ground state in correlated graphene systems. \nReferences: \n[1] Zhou\, H.\, Xie\, T.\, Taniguchi\, T. et al. Nature 598\, 434–438 (2021). \n[2] Zhou\, H.\, Xie\, T.\, Ghazaryan\, A.\, et al. Nature 598\, 429–433 (2021). \n[3] Arp\, T.\, et. al. arXiv:2310.03781 (2023).
URL:https://qmi.miffanytark.com/event/special-seminar-owen-sheekey-ucsb-inter-valley-coherence-intrinsic-and-extrinsic-spin-orbit-coupling-in-rhombohedral-graphene/
LOCATION:McLeod 3038\, 2356 Main Mall\, Vancouver\, British Columbia\, V6T 1Z3\, Canada
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240530T100000
DTEND;TZID=America/Vancouver:20240530T110000
DTSTAMP:20240514T160912Z
CREATED:20240514T160912Z
LAST-MODIFIED:20240514T160912Z
UID:7454-1717063200-1717066800@qmi.miffanytark.com
SUMMARY:Ultrafast quantum simulation and quantum computing with ultracold atom arrays at quantum speed limit
DESCRIPTION:Abstract: Many-body correlations drive a variety of important quantum phenomena and quantum machines including superconductivity and magnetism in condensed matter as well as quantum computers. Understanding and controlling quantum many-body correlations is thus one of the central goals of modern science and technology. My research group has recently pioneered a novel pathway towards this goal with nearby ultracold atoms excited with an ultrashort laser pulse to a Rydberg state far beyond the Rydberg blockade regime [1-7]. We first applied our  ultrafast coherent control with attosecond precision [2\,3] to a random ensemble of those Rydberg atoms in an optical dipole trap\, and successfully observed and controlled their strongly correlated electron dynamics on a sub-nanosecond timescale [1]. This new approach is now applied to arbitrary atom arrays assembled with optical lattices or optical tweezers that develop into a pathbreaking platform for quantum simulation and quantum computing on an ultrafast timescale [4-7]. \nIn this ultrafast quantum computing\, as schematically shown in Fig. 1\, we have recently succeeded in executing a controlled-Z gate\, a conditional two-qubit gate essential for quantum computing\, in only 6.5 nanoseconds at quantum speed limit\, where the gate speed is solely determined by the interaction strength between two qubits [5]. This is faster than any other two-qubit gates with cold-atom hardware by two orders of magnitude. It is also two orders of magnitude faster than the noise from the external environment and operating lasers\, whose timescale is in general 1 microsecond or slower\, and thus can be safely isolated from the noise. Moreover\, this two-qubit gate is faster than the fast two-qubit gate demonstrated recently by “Google AI Quantum” with superconducting qubits [8]. \nFigure 1. Conceptual diagram of the ultrafast twoqubit gate for quantum computing with cold atoms. Two single atoms captured in optical tweezers (red light) with a separation of a micrometer are entangled with an ultrafast laser pulse (blue light) shone for only 10 picoseconds [5]. Image source: Dr. Takafumi Tomita (IMS).\nReferences\n[1] N. Takei et al.\, Nature Commun. 7\, 13449 (2016).\nHighlighted by Science 354\, 1388 (2016); IOP PhyscisWorld.com (2016).\n[2] H. Katsuki et al.\, Acc. Chem. Res. 51\, 1174 (2018).\n[3] C. Liu et al.\, Phys. Rev. Lett. 121\, 173201 (2018).\n[4] M. Mizoguchi et al.\, Phys. Rev. Lett. 124\, 253201 (2020).\n[5] Y. Chew et al.\, Nature Photonics 16\, 724 (2022). (Front Cover Highlight)\n[6] V. Bharti et al.\, Phys. Rev. Lett. 131\, 123201 (2023).\n[7] V. Bharti et al.\, arXiv:2311.15575 (2023).\n[8] B. Foxen et al.\, Phys. Rev. Lett. 125\, 120504 (2020). \nSpeaker Bio: Kenji Ohmori is a Chair Professor at the Institute for Molecular Science (IMS)\, National Institutes of Natural Sciences\, Japan. After receiving his Ph.D. from The University of Tokyo in 1992\, he was a Research Associate and an Associate Professor at Tohoku University. In 2003 he was appointed a Full Professor at IMS. \nProfessor Ohmori is currently leading large-scale / long-term national projects on the development of ultrafast quantum simulators and quantum computers (2018-2030) generously supported with priority by the Ministry of Education\, Culture\, Sports\, Science and Technology (MEXT) and Cabinet Office of the government of Japan\, expected as one of the front runners in quantum technologies. \nHe has been celebrated with many honors. Highlights include the Japan Academy Medal (2007)\, Fellow of the American Physical Society (2009)\, Humboldt Research Award from the government of Germany (2012)\, Commendation for Science and Technology by the Minister of MEXT (2018)\, and the Medal with Purple Ribbon by His Majesty the Emperor of Japan for his achievements on quantum physics (2021). The Medal with Purple Ribbon is awarded for inventions and discoveries in science and technology\, and for outstanding achievements in the fields of science\, sports\, art and culture. \nProfessor Ohmori is currently serving as the Chair of the Committee for Quantum Science and Technology Policy\, MEXT\, Japan since 2023\, after serving as the Vice Chair of the same committee from 2015-2022. \nIt was officially announced in February 2024 that Professor Ohmori and his team established the “Commercialization Preparatory Platform” for their “cold (neutral) atom” quantum computer where 13 topnotch industries have joined\, including Development Bank of Japan Inc.\, Hitachi\, Ltd.\, Fujitsu Limited\, NEC Corporation\, and Hamamatsu Photonics K.K. The relevant start-up company will be launched within the Japanese Fiscal Year 2024.
URL:https://qmi.miffanytark.com/event/ultrafast-quantum-simulation-and-quantum-computing-with-ultracold-atom-arrays-at-quantum-speed-limit/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240514T130000
DTEND;TZID=America/Vancouver:20240514T140000
DTSTAMP:20240430T172048Z
CREATED:20240430T172048Z
LAST-MODIFIED:20240430T172048Z
UID:7413-1715691600-1715695200@qmi.miffanytark.com
SUMMARY:Special CM Seminar: Étienne Lantagne-Hurtubise – Caltech: Graphene multilayers: from unconventional superconductors to quantum devices
DESCRIPTION:Étienne Lantagne-Hurtubise – Caltech\nTitle: Graphene multilayers: from unconventional superconductors to quantum devices \nAbstract: Crystalline graphene multilayers present a rich playground to explore correlated electronic phenomena in a tunable and ultra-clean setting. For instance\, Bernal bilayer graphene and rhombohedral trilayer graphene host multiple symmetry-broken metallic phases at low temperature\, as well as unconventional superconductors with different pairing symmetries. The rich phase diagram of these systems can further be tuned through proximity to WSe2\, which induces spin-orbit coupling in the graphene layers and leads to a dramatic enhancement of superconductivity that remains poorly understood. I will first discuss the lessons learned from our theoretical exploration of graphene multilayers with induced spin-orbit coupling\, focusing on various types of magnetic and inter-valley coherent ground states and their possible connections to superconductivity. I will then outline a recipe to engineer topological superconductivity in graphene multilayers using gate-defined Josephson junctions. Such a platform provides a promising alternative to traditional architectures for Majorana zero-modes due to its purity\, gate tunability and atomically thin nature.\nSpeaker Bio: Étienne Lantagne-Hurtubise completed his PhD at UBC\, and worked at QMI with Professor Marcel Franz. He is currently a postdoctoral fellow at Caltech.
URL:https://qmi.miffanytark.com/event/special-cm-seminar-etienne-lantagne-hurtubise-caltech-graphene-multilayers-from-unconventional-superconductors-to-quantum-devices/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240418T100000
DTEND;TZID=America/Vancouver:20240418T110000
DTSTAMP:20240404T042427Z
CREATED:20240404T042427Z
LAST-MODIFIED:20240404T042427Z
UID:7281-1713434400-1713438000@qmi.miffanytark.com
SUMMARY:CM Seminar: Michael Zaletel – University of California Berkley: Anomalous Hall Crystals in Graphene: interaction-driven Chern bands at zero magnetic field
DESCRIPTION:Michael Zaletel – University of California Berkley\nTitle: Anomalous Hall Crystals in Graphene: interaction-driven Chern bands at zero magnetic field \nAbstract: Recent experiments have discovered that pentalayer-graphene subject to a moire superlattice spontaneously breaks time-reversal\, resulting in a quantized anomalous Hall effect at zero magnetic field. At fractional filling\, the material exhibits a zero-field fractional quantum Hall effect. In contrast to other moire-materials\, the origin of Chern bands in this material is not so clear. I will present a theoretical picture in which Chern bands arise from an “anomalous Hall crystal” stabilized primarily by interactions.  So far this picture is supported mainly by mean-field calculations\, so I’ll conclude with some open questions about how the Hall crystal could be verified.   \nSpeaker Bio: Michael Zaletel is an Associate Professor of Physics and the\nAllison and Thomas Schneider Chair at UC Berkley.
URL:https://qmi.miffanytark.com/event/cm-seminar-michael-zaletel-university-of-california-berkley-anomalous-hall-crystals-in-graphene-interaction-driven-chern-bands-at-zero-magnetic-field/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240413T110000
DTEND;TZID=America/Vancouver:20240413T140000
DTSTAMP:20240328T204628Z
CREATED:20240328T204628Z
LAST-MODIFIED:20240328T204628Z
UID:7255-1713006000-1713016800@qmi.miffanytark.com
SUMMARY:World Quantum Family and Friends Day
DESCRIPTION:We are happy to organize Friends and Family Day at the Blusson Quantum Matter Institute. \nThis is a celebration of the QMI Community and World Quantum Day. \nPlease register here. \nLab Tours\nThe following labs will be open to the public. Volunteers will give brief explanations of each lab:\n• The Scanning Tunneling Microscopy Lab\n• The Ultrafast Spectroscopy Lab\n• The Quantum Materials Lab\n• The 2D Materials Lab\n• The Photonics & Nanostructures Lab\n• The Angle-Resolved Photoemission Spectroscopy Lab \nSuperconductor Track\nOur famous superconductor track will be on display throughout the event\, run by the one and\nonly James Day. \nAstronomy Station\nStop by a cosmic experience run by Jess McIver. \nRefreshments and Ice Cream\nCoffee will be available in the morning. Ice cream for the event will be hosted by Mona Berciu! \nMerch\nKids will receive QMI stickers and buttons. \nFun Passport\nKids (and adults?) will be provided with an event passport to explore the building and express their artistic skills. \nSocialize\nThe event is a great opportunity to socialize with the QMI community. Mingle with other QMI\nparents and friends in the lobby area\, while exploring the building\, or at the rest areas.
URL:https://qmi.miffanytark.com/event/world-quantum-family-and-friends-day/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240410T140000
DTEND;TZID=America/Vancouver:20240410T150000
DTSTAMP:20240405T180932Z
CREATED:20240405T180932Z
LAST-MODIFIED:20240405T180932Z
UID:7287-1712757600-1712761200@qmi.miffanytark.com
SUMMARY:CM Seminar: Domenico Giuliano – Department of Physics\, Università della Calabria\, Italy: Dissipation driven dynamical topological phase transitions in two-dimensional superconductors
DESCRIPTION:Domenico Giuliano – Department of Physics\, Università della Calabria\, Italy\nTitle: Dissipation driven dynamical topological phase transitions in two-dimensional superconductors \nAbstract: By quenching the interaction strength\, we induce and study a topological dynamical phase transition between superconducting phases of a planar fermionic model. Using the Lindblad Master Equation approach to account for the interactions of Bogoliubov quasiparticles among themselves and with the fluctuations of the superconducting order parameter\, we derive the corresponding relaxation dynamics of the order parameter. To fully characterize the phase transition\, we also compute the fidelity and the spin-Hall conductance of the system. Our approach provides us crucial informations for experimental implementations\, such as the dependence of the critical time on the system-bath coupling. \nSpeaker Bio: Domenico Giuliano has received his Ph. D. in 1998 from the Università di Napoli (Naples University) “Federico II” – Italy. During his Ph. D. he has spent six months at Stanford University\, under the supervision of Prof. Robert Laughlin. After graduating\, he moved back to Stanford\, on a two-year post-doc appointment\, supervised again by Prof. Laughlin. After that\, he has spent  two more years in Napoli as a post-doc research associate under the supervision of Prof. Arturo Tagliacozzo\, in 2003 he has become a university researcher at the University of Calabria\, in Soutern Italy. From year 2020 he is an associate professor of theorical physics at the same university. In the past\, he has been visiting several times the department of Physics at the University of British Coumbia\, on a long-lasting scientific collaboration with Prof. Ian Affleck and his group.  Domenico’s main research interest are in theoretical condensed matter. They include: Fractionalization of quantum number and fractional statistics; Low-dimensional correlated system\, including one-dimensional Luttinger liquids; Topological insulators and topological superconductors; Kondo effect and its applications; Quantum phase transitions.
URL:https://qmi.miffanytark.com/event/cm-seminar-domenico-giuliano-department-of-physics-universita-della-calabria-italy-dissipation-driven-dynamical-topological-phase-transitions-in-two-dimensional-superconductors/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240404T100000
DTEND;TZID=America/Vancouver:20240404T110000
DTSTAMP:20240403T183148Z
CREATED:20240403T183148Z
LAST-MODIFIED:20240403T183148Z
UID:7269-1712224800-1712228400@qmi.miffanytark.com
SUMMARY:CM Seminar: Fiona Burnell – University of Minnesota: Stabilizing topologically non-trivial steady states with local dynamics in open quantum systems
DESCRIPTION:Fiona Burnell – University of Minnesota\nTitle: Electrons in twisted layers: design\, surprise\, and a new set of eyes \nAbstract: The goal of building a quantum computer has lead to rapid advances in experiments that allow for high-precision dynamical control of quantum systems at the single qubit level.  However\, a major challenge in harnessing the power of these devices is in understanding how best to control noise.  In particular\, many interesting phases of matter\, including topological phases\, that exist in closed quantum systems are not stable at finite temperature\, suggesting that they are particularly sensitive to the kinds of open-system noise present in such devices.  Quantum error correction protocols can be used to rectify this\, but these involve non-local processes.  In this talk\, I will explore approaches to stabilizing symmetry-protected topological order at arbitrarily long times in 1 dimension using local open-system dynamics.  I will show that this can be done when the noise is of a particular type relevant to Rydberg atom arrays\, known as biased erasure noise\, and comment on the implications of these results for possible steady-state phases of open quantum systems. \nSpeaker Bio: Fiona Burnell is a UBC alumnae and an associate professor at the University of Minnesota.  Her research interests include understanding how topology and symmetry dictate the possible phases of matter that can be found in nature\,  studying how and when quantum dynamics can result in systems evading their naive thermal equilibrium\, and contemplating experiments that can reveal patterns of quantum entanglement in many-body systems.
URL:https://qmi.miffanytark.com/event/cm-seminar-fiona-burnell-university-of-minnesota-stabilizing-topologically-non-trivial-steady-states-with-local-dynamics-in-open-quantum-systems/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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:20240327T100000
DTEND;TZID=America/Vancouver:20240327T120000
DTSTAMP:20240311T155918Z
CREATED:20240311T155918Z
LAST-MODIFIED:20240311T155918Z
UID:7127-1711533600-1711540800@qmi.miffanytark.com
SUMMARY:Quantum Materials; Innovations and Commercialization Prospects
DESCRIPTION:As Canada embarks on a bold journey with its National Quantum Strategy\, backed by a $360 million investment in addition to other investments\, we stand at the forefront of quantum technology development. This strategic move underlines Canada’s commitment to leading in the global quantum revolution. \nOur upcoming webinar will shed light on the latest breakthroughs and commercialization opportunities within the quantum sector. Featuring experts from Canada’s leading quantum material research hubs\, this event promises a deep dive into the collaborative\, interdisciplinary efforts fueling the discovery of novel materials and the development of groundbreaking technologies. \nFeatured Speakers: \n\nDr. Louis Taillefer — Professor\, University of Sherbrooke; Co-Director\, CIFAR Quantum Materials Program\nDr. Adina Luican-Mayer (Professor\, Director) NSERC Training Program Materials for Quantum Technologies (MaQTech)\, University of Ottawa\nDr. Andrea Damascelli (Professor\, Scientific Director): Stewart Blusson Quantum Matter Institute (QMI)\, University of British Columbia\nDr. Nathan Nelson-Fitzpatrick (Director): Quantum-Nano Fabrication and Characterization Facility (QNFCF)\, University of Waterloo
URL:https://qmi.miffanytark.com/event/quantum-materials-innovations-and-commercialization-prospects/
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
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