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DTSTART;TZID=America/Vancouver:20261015T100000
DTEND;TZID=America/Vancouver:20261015T110000
DTSTAMP:20261014T223316Z
CREATED:20261013T170104Z
LAST-MODIFIED:20261014T223316Z
UID:11447-1792058400-1792062000@qmi.miffanytark.com
SUMMARY:CM Seminar: Two-Dimensional HighTc Superconductivity in Monolayer Cuprates & Beyond
DESCRIPTION:Featured Speaker: Yuanbo Zhang (Fudan University\, Shangehai\, China) \nTwo-Dimensional High-Tc​ Superconductivity in Monolayer Cuprates and Beyond\nCopper oxide high-temperature superconductors share a layered structure\, raising the question of whether superconductivity can emerge in an isolated monolayer. We investigate the electronic structure of monolayer Bi-2212 and Bi-2201\, demonstrating through STM/STS that the full suite of bulk phases—including high-Tc​ superconductivity\, pseudogap\, and charge order—persists in the extreme 2D limit. These results indicate that superconductivity in these materials is essentially a two-dimensional phenomenon. \nHowever\, extending this research to other high-Tc material systems is often hindered by extreme environmental sensitivity. To address this\, we have developed an integrated fabrication platform operating entirely under ultra-high vacuum (with base pressure below 5×10−10 mbar). This system enables the exfoliation and assembly of atomically clean 2D heterostructures\, providing a pristine environment to explore the next generation of 2D high-Tc superconductors. \nLocation: BRIM 311\nDate &Time: October 15\, 10:00-11:00am
URL:https://qmi.miffanytark.com/event/cm-seminar-two-dimensional-high-tc-superconductivity-in-monolayer-cuprates-beyond/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=image/jpeg:https://qmi.miffanytark.com/wp-content/uploads/2026/10/CM-Thumbnail.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20261008T100000
DTEND;TZID=America/Vancouver:20261008T110000
DTSTAMP:20261005T181437Z
CREATED:20261005T181437Z
LAST-MODIFIED:20261005T181437Z
UID:11446-1791453600-1791457200@qmi.miffanytark.com
SUMMARY:CM Seminar: Visualizing atomic scale deformation & de-pinning of a charge density wave
DESCRIPTION:Featured Speaker: Christopher Gutiérrez (UCLA) \nVisualizing atomic scale deformation & de-pinning of a charge density wave\nThe charge density wave (CDW) is a symmetry-broken state of matter that is ubiquitous across quantum materials. Its signature is a periodic modulation of electron charge and lattice ions. In quasi one-dimensional systems\, an applied electric field can distort the CDW before it finally de-pins itself and moves collectively through the crystal. Notably\, this process has never been imaged directly. In this talk\, I will show experiments that combine in-plane drive currents with scanning tunneling microscopy and spectroscopy (STM/STS) to investigate the nanoscale field-response on the surface of a prototypical Peierls CDW material\, K0.3MoO3. By tuning the in-plane drive current\, we directly visualize a hysteretic (“memory”) response in the surface CDW as it plastically deforms before evolving between ordered/disordered states through the annihilation/generation of topological defects (vortices) in the phase of the CDW order parameter. Our results demonstrate that surface CDWs are manipulable with behavior similar to proposed microscopic models of bulk CDW dynamics. \nLocation: BRIM 311\nDate &Time: October 8\, 10:00-11:00am
URL:https://qmi.miffanytark.com/event/cm-seminar-visualizing-atomic-scale-deformation-de-pinning-of-a-charge-density-wave/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260924T100000
DTEND;TZID=America/Vancouver:20260924T110000
DTSTAMP:20260918T222322Z
CREATED:20260918T222322Z
LAST-MODIFIED:20260918T222322Z
UID:9578-1790244000-1790247600@qmi.miffanytark.com
SUMMARY:CM Seminar: Catalog of Altermagnetism in Magnetic Wallpaper/Space Groups and Nonsymmorphic Altermagnets\, Dr. Ching-Kai Chiu (RIKEN)
DESCRIPTION:Speaker:Dr. Ching-Kai Chiu\, RIKEN \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Catalog of Altermagnetism in Magnetic Wallpaper/Space Groups and Nonsymmorphic Altermagnets \nAbstract: Altermagnets\, a third class of collinear magnets\, have zero net magnetization but spin-split bands\, even without spin–orbit coupling. Their standard classification into six wave types (d-\, g-\, and i-wave in 2D and 3D) relies on magnetic point groups of mostly centrosymmetric crystals. In this talk\, I will show that spinless time reversal replaces inversion\, so altermagnetism extends to non-centrosymmetric crystals. We catalog the Brillouin-zone spin splitting of all 17 altermagnetic wallpaper groups and 422 altermagnetic space groups\, 262 of which lack inversion\, consistent with the literature. Furthermore\, nonsymmorphic symmetries\, such as glide mirrors and screw axes\, enforce same-spin degeneracies on the zone boundary. Together with the opposite-spin degeneracies\, they force hourglass band crossings\, creating spin textures beyond the six wave types\, such as an i-wave-like spin winding on a square lattice. Our catalog serves as a guide for finding new altermagnets.\n\nReference: C. Le\, F. Cui\, I.-F. Io\, M. M. Hirschmann\, X. Wu\, and C.-K. Chiu\, arXiv:2607.10857 (2026).
URL:https://qmi.miffanytark.com/event/cm-seminar-catalog-of-altermagnetism-in-magnetic-wallpaper-space-groups-and-nonsymmorphic-altermagnets-dr-ching-kai-chiu-riken/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260917T100000
DTEND;TZID=America/Vancouver:20260917T110000
DTSTAMP:20260910T050431Z
CREATED:20260910T050431Z
LAST-MODIFIED:20260910T050431Z
UID:11444-1789639200-1789642800@qmi.miffanytark.com
SUMMARY:CM Seminar: Coherent bunching of anyons and their dissociation in interference experiments\, Moty Heiblum\, Weizmann Institute of Science
DESCRIPTION:Speaker: Moty Heiblum\, Weizmann Institute of Science \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Coherent bunching of anyons and their dissociation in interference experiments \nAbstract: \nAharonov–Bohm interference of fractional quasiparticles in the quantum Hall effect generally reveals their elementary charge (e*). Recently\, our novel interferometry experiments found flux periods of ΔΦ = (e/e*)Φ0 (Φ0 the flux quantum) at moderate temperatures. More recent interference experiments of ‘particle–hole conjugated’ states (ν = 2/3\, 3/5\, and 4/7)\, revealed unexpected flux periodicities of ΔΦ = ν−1Φ0. Moreover\, the measured Fano factor (F) of the partitioned quasiparticles (in the interferometer’s quantum point contacts) was found to be F = ν\, instead of F = e*/e. These observations indicate that the interference (and F) suggest bunching (clustering) of the elementary quasiparticles\, such as coherent pairs\, triplets\, and quadruplets\, respectively. A small metallic gate (‘top-gate’)\, deposited in the center of the interferometer bulk\, forms an antidot (or a dot) when charged\, thus introducing ‘local quasiparticles’ at its perimeter in the bulk. Surprisingly\, charging the dot led to an unexpected dissociation of the ‘bunched quasiparticles’\, thus recovering the conventional flux periodicity set by the elementary charges. However\, the Fano factors consistently remained as F = ν. The two observations—bunching and debunching (dissociation)—were not expected by current theories. Planned experiments with Jain’s ‘particle states’ and with ‘even denominator states’ are planned.
URL:https://qmi.miffanytark.com/event/cm-seminar-coherent-bunching-of-anyons-and-their-dissociation-in-interference-experiments-moty-heiblum-weizmann-institute-of-science/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260910T100000
DTEND;TZID=America/Vancouver:20260910T110000
DTSTAMP:20260901T233335Z
CREATED:20260901T233335Z
LAST-MODIFIED:20260901T233335Z
UID:9504-1789034400-1789038000@qmi.miffanytark.com
SUMMARY:CM Seminar: The Nonlinear Terahertz Response of Graphene\, Marc Dignam\, Queen’s University
DESCRIPTION:Speaker: Marc Dignam\, Queen’s University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: The Nonlinear Terahertz Response of Graphene \nAbstract: \nOver the past decade or more\, there has been a great deal of interest in the mechanical\, electronic and optical properties of graphene. The interest in the optical properties of graphene stems largely from two key features of the electronic band structure: it is gapless and the dispersion is linear near the Dirac points where the two bands touch.  Both features can be uniquely accessed using terahertz radiation\, because\, under the right conditions\, it can strongly drive both interband and intraband transitions. In this talk\, I will describe the formalism and computational results of our density-matrix approach to modelling the nonlinear terahertz response of graphene\, including various scattering mechanisms. As I will show\, in undoped graphene\, a very large nonlinearity can arise due to the interplay between the intraband and interband transitions. I will finish by showing how a parallel-plate waveguide configuration containing graphene can be used to generate the third harmonic of a 2.0 terahertz incident field with a power conversion efficiency of up to 20%. If time allows\, I will also discuss density functional results for the effects of impurities and strain on third harmonic generation in graphene. \nBiography: Marc Dignam received his PhD in theoretical condensed matter physics from the University of Toronto in 1991 and held a postdoctoral fellowship at AT&T Bell Labs in Murray Hill (1991–1993)\, working under Nobel laureate Horst Störmer. In 1994\, he joined MPB Technologies as an NSERC Industrial Research Fellow\, modelling and designing fibre‑optic communication devices and systems. He was a professor in the Department of Physics\, Engineering Physics & Astronomy at Queen’s University from 2000 to 2026 and is now a Professor Emeritus at Queen’s. Dr. Dignam’s research is in theoretical and computational condensed matter physics and optics. He has worked on the linear and nonlinear optical and terahertz response of semiconductor superlattices\, quantum wells\, and nanorods; the nonlinear terahertz response of monolayer and bilayer graphene; and nonlinear quantum optics in ring‑resonator and photonic‑crystal systems.
URL:https://qmi.miffanytark.com/event/cm-seminar-the-nonlinear-terahertz-response-of-graphene-marc-dignam-queens-university/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260416T100000
DTEND;TZID=America/Vancouver:20260416T110000
DTSTAMP:20260327T202930Z
CREATED:20260327T202930Z
LAST-MODIFIED:20260327T202930Z
UID:9279-1776333600-1776337200@qmi.miffanytark.com
SUMMARY:CM Seminar: Belonging at QMI: What Our Community Told Us\, James Day\, UBC Blusson QMI
DESCRIPTION:Speaker: James Day\, UBC Blusson QMI \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Belonging at QMI: What Our Community Told Us \nAbstract: In fall 2025\, members of the QMI community were invited to share their experiences of equity\, inclusion\, and belonging at the institute. This presentation summarizes preliminary findings from survey responses across our community. The results show strengths\, including high levels of respect within immediate lab environments\, comfort sharing opinions\, and recognition of diverse perspectives. At the same time\, the survey identifies a major institutional challenge: while many respondents report a strong sense of belonging within their own labs\, that feeling drops substantially at the institute level. Qualitative responses point to recurring concerns around supervision and power\, caregiving and flexibility\, accessibility of physical spaces\, and everyday cultural practices that can unintentionally exclude. On behalf of the EDI Committee\, I will highlight these themes and share practical next steps that could help QMI become a more connected\, inclusive\, and supportive community. The presentation will be short\, leaving lots of time for conversation.
URL:https://qmi.miffanytark.com/event/cm-seminar-belonging-at-qmi-what-our-community-told-us-james-day-ubc-blusson-qmi/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260409T100000
DTEND;TZID=America/Vancouver:20260409T110000
DTSTAMP:20260331T170316Z
CREATED:20260331T170316Z
LAST-MODIFIED:20260331T170316Z
UID:9281-1775728800-1775732400@qmi.miffanytark.com
SUMMARY:CM Seminar: Which Material is worth Studying? (from the viewpoint of quantum materials)\, Leslie M. Schoop\, Princeton University
DESCRIPTION:Speaker: Leslie M. Schoop – Department of Chemistry – Princeton University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Which Material is worth Studying? (from the viewpoint of quantum materials) \nAbstract: Quantum materials are hoped to change technology in various aspects. However\, most of the desired applications are hindered by the lack of suitable materials. While we know tens of thousands of crystalline inorganic compounds\, we studied only a tiny fraction of those for their potential as quantum materials. As synthesis of such materials\, especially in single crystal form\, can be challenging\, a brute force experimental study of all known crystalline inorganic compounds is not feasible. In my group\, we are developing simple concepts that guide us to find those materials worth growing and studying. We are using concepts from chemistry to understand\, predict and synthesize new quantum materials. In this talk\, I will show how simple concepts derived from the theory of chemical bonding allow us to make predictions about electronic structures of materials\, which we can then use to find various types of new quantum materials. For example\, thinking about the degree of delocalization in a chemical bond can be helpful to find kagome or linear-chain materials with band structures that better resemble simple tight binding models\, and therefore can fulfill predictions made for certain materials based on “pen and paper” theory. I will give a general overview how powerful chemical concepts are in materials discovery and highlight a flute of materials that were discovered in this light.
URL:https://qmi.miffanytark.com/event/cm-seminar-which-material-is-worth-studying-from-the-viewpoint-of-quantum-materials-leslie-m-schoop-princeton-university/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260402T100000
DTEND;TZID=America/Vancouver:20260402T110000
DTSTAMP:20260325T024634Z
CREATED:20260325T024634Z
LAST-MODIFIED:20260325T024634Z
UID:9276-1775124000-1775127600@qmi.miffanytark.com
SUMMARY:CM Seminar: High rank multipole order: feeling the strain\, Ian Fisher\, Stanford University
DESCRIPTION:Speaker: Ian Fisher\, Stanford University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: High rank multipole order: feeling the strain \nAbstract: Interactions can lead to a wide variety of ordered states in materials. Phase transitions in which local atomic states develop spontaneous high rank multipole order provides a particularly rich arena for new insights. A key element in the study of such systems is the ability to couple to the associated order parameter. \nI will describe how one can couple to a variety of different multipolar states\, motivating new methodologies to measure a fundamental thermodynamic material property\, the multipole susceptibility. One can also identify effective transverse fields\, which\, when applied inside the ordered state\, induce quantum fluctuations and can drive a multipolar quantum phase transition. I will explain the very special roles that strain can play for each of the cases\, and will outline new experimental approaches in which the materials ‘feel the strain’ in different ways. \nEven while we manipulate the crystal lattice to tune electronic order\, hyperfine interactions are not always completely innocent. Along the way I will introduce the special case of an electro-nuclear quantum phase transition. 
URL:https://qmi.miffanytark.com/event/cm-seminar-high-rank-multipole-order-feeling-the-strain-ian-fisher-stanford-university/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260326T100000
DTEND;TZID=America/Vancouver:20260326T110000
DTSTAMP:20260316T221454Z
CREATED:20260316T221454Z
LAST-MODIFIED:20260316T221454Z
UID:9265-1774519200-1774522800@qmi.miffanytark.com
SUMMARY:CM Seminar: Real-Space Superconductivity: Schafroth\, Bipolarons\, Cuprates\, Pavel Kornilovich (Oregon State University)
DESCRIPTION:Speaker: Pavel Kornilovich\, Oregon State University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Real-Space Superconductivity: Schafroth\, Bipolarons\, Cuprates \nAbstract: The idea that superconductivity might arise from the condensation of real-space electron pairs was proposed by Swiss physicist Robert Schafroth several years before the development of BCS theory. Although this concept is now known as Bose-Einstein-condensation superconductivity\, Schafroth’s contributions are largely forgotten. In this talk\, I will briefly review Schafroth’s work and his complex relationships with John Bardeen and Leon Cooper. I will then describe a version of real-space superconductivity involving phonon bipolarons as normal-state charge carriers. I argue that anisotropic bipolarons account for many of the properties of the copper-oxide superconductors discovered in 1986. I will discuss how a deeper understanding of bipolarons might help raise the critical temperature beyond the current record of 133 K.
URL:https://qmi.miffanytark.com/event/cm-seminar-real-space-superconductivity-schafroth-bipolarons-cuprates-pavel-kornilovich-oregon-state-university/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260312T100000
DTEND;TZID=America/Vancouver:20260312T110000
DTSTAMP:20260305T234644Z
CREATED:20260305T234644Z
LAST-MODIFIED:20260305T234644Z
UID:9247-1773309600-1773313200@qmi.miffanytark.com
SUMMARY:CM Seminar: Foundational Graph Atomic Cluster Expansion for Atomistic Thermodynamic and Kinetic Simulation\, Ralf Drautz\, Ruhr-Universität Bochum
DESCRIPTION:Speaker: Ralf Drautz\, Ruhr-Universität Bochum \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Foundational Graph Atomic Cluster Expansion for Atomistic Thermodynamic and Kinetic Simulation \nAbstract: The atomic-scale simulation of technological materials requires a departure from task-specific approximations toward universal foundations capable of generalizing across diverse chemistries. While first-principles methods offer the necessary accuracy\, they lack the scalability required for foundational coverage. This presentation introduces the Graph Atomic Cluster Expansion (GRACE)\, a framework designed to bridge this gap by providing a mathematically complete and computationally efficient description of atomic interactions. \nGRACE unifies equivariant message-passing with high-body-order polynomials\, enabling the development of foundational parameterizations that span the periodic table. I will demonstrate that GRACE facilitates robust thermodynamic and kinetic simulations for a wide range of materials\, including materials with complex\, multi-component compositions. Specific applications will be presented\, including the computation of phase diagrams and the prediction of diffusion kinetics in complex solids. Finally\, I will address the incorporation of magnetism and charge transfer and discuss the systematic generation of comprehensive training datasets for creating transferable and accurate foundational parameterizations.
URL:https://qmi.miffanytark.com/event/cm-seminar-foundational-graph-atomic-cluster-expansion-for-atomistic-thermodynamic-and-kinetic-simulation-ralf-drautz-ruhr-universitat-bochum/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260305T100000
DTEND;TZID=America/Vancouver:20260305T110000
DTSTAMP:20260226T204101Z
CREATED:20260226T204101Z
LAST-MODIFIED:20260226T204101Z
UID:9238-1772704800-1772708400@qmi.miffanytark.com
SUMMARY:CM Seminar: Phonons with a Twist: Measuring the Phonon Hall Viscosity in a Proposed Quantum Spin Liquid\, Brad Ramshaw\, Cornell University
DESCRIPTION:Speaker: Brad Ramshaw\, Cornell University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Phonons with a Twist: Measuring the Phonon Hall Viscosity in a Proposed Quantum Spin Liquid \nAbstract: The thermal Hall effect\, where a temperature gradient develops perpendicular to both a heat current and an applied magnetic field\, has emerged unexpectedly in a wide range of insulating materials. These include the Mott-insulating parent compounds of cuprate superconductors\, several proposed spin-liquid candidates\, and\, more recently\, almost everything. This raises fundamental questions: Are these thermal Hall effects driven by intrinsic coupling between heat carriers and magnetic fields? What are the heat carriers? And can we trust the data? \nRuCl3 has been at the center of this debate\, initially proposed to host chiral Majorana edge modes that produce a quantized thermal Hall effect. Competing explanations invoke phonon skew scattering – an extrinsic mechanism. \nI will introduce the concept of phonon Berry curvature and show how it gives rise to phonon Hall viscosity – a dissipationless viscosity that rotates phonon polarizations and bends their trajectories. I will then show how we use ultrasonic measurements to directly probe phonon Hall viscosity. Our results reveal that phonons in RuCl3 exhibit a Hall viscosity that both qualitatively and quantitatively accounts for the observed thermal Hall effect. This finding overturns both prevailing views: the thermal Hall effect in RuCl3 is neither extrinsic nor is it due to Majorana edge modes. Instead\, it arises from intrinsic coupling between lattice and spin degrees of freedom. \nMore broadly\, I will argue that the acoustic Faraday effect is a powerful tool for detecting phonon Hall viscosity and the associated Berry curvature in gapped topological states of matter. I will also comment on the current state of thermal transport experiments and give a possible explanation for the unexpected abundance of insulators with thermal Hall effects.
URL:https://qmi.miffanytark.com/event/cm-seminar-phonons-with-a-twist-measuring-the-phonon-hall-viscosity-in-a-proposed-quantum-spin-liquid-brad-ramshaw-cornell-university/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260226T100000
DTEND;TZID=America/Vancouver:20260226T110000
DTSTAMP:20260224T000532Z
CREATED:20260224T000532Z
LAST-MODIFIED:20260224T000532Z
UID:9183-1772100000-1772103600@qmi.miffanytark.com
SUMMARY:CM Seminar: Cryogenic electron microscopy of polar order in a quantum paraelectric\, Ismail El Baggari\, UBC
DESCRIPTION:Speaker: Ismail El Baggari\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Scanning transmission electron microscopy (STEM) now routinely resolves the atomic structure and chemistry of materials with sub-angstrom resolution. Recent advances in instrumentation further allow spatially resolved mapping of subtle\, picometer-scale atomic shifts that underpin emergent functional properties. In ferroelectrics\, for example\, polarization arises from tiny atomic displacements that break inversion symmetry; STEM can locally visualize these displacements and reveal novel polarization textures.  \nDespite this potential\, STEM applications have traditionally been restricted to room temperature (or higher) because of longstanding challenges in implementing stable liquid-helium cryogenic cooling\, such as vibrations and inadequate temperature control. My group has been addressing these limitations by developing dedicated liquid helium cryogenic STEM instrumentation to probe materials whose emergent properties appear only at low temperatures. We have now overcome key technical hurdles and can cool samples inside the microscope to cryogenic regimes down to ~20 K. I will present recent applications of cryogenic STEM to imaging order and disorder in ferroelectrics. In particular\, I will highlight quantum paraelectric SrTiO₃\, a material that hovers on the verge of ferroelectricity yet remains paraelectric to the lowest temperatures due to quantum fluctuations. Using cryogenic STEM\, we directly visualize emergent nanoscale polar textures and mesoscale correlations in this quantum paraelectric phase. \n  \nZhang et al. “Inverse Melting of Polar Order in Chemically Substituted BaTiO3.” Physical Review Letters 134.25 (2025) \nRennich\, et al. “Ultracold cryogenic TEM with liquid helium and high stability.” Proceedings of the National Academy of Sciences122.36 (2025) \nZhang et al. “Nanoscale Polar Landscapes in Quantum Paraelectric SrTiO3.” arXiv:2509.24969 (2025).
URL:https://qmi.miffanytark.com/event/cm-seminar-cryogenic-electron-microscopy-of-polar-order-in-a-quantum-paraelectric-ismail-el-baggary-ubc/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260212T100000
DTEND;TZID=America/Vancouver:20260212T110000
DTSTAMP:20260206T191900Z
CREATED:20260206T191900Z
LAST-MODIFIED:20260206T191900Z
UID:9167-1770890400-1770894000@qmi.miffanytark.com
SUMMARY:CM Seminar: Signature of preformed pairs in angle-resolved two-electron coincidence photoemission\, Janez Bonča\, University of Ljubljana.
DESCRIPTION:Speaker: Janez Bonča\, University of Ljubljana \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Signature of preformed pairs in angle-resolved two-electron coincidence photoemission \nAbstract: We employ density matrix renormalization group (DMRG) and variational exact diagonalization (VED) to compute single- and two-electron removal spectra of the Hubbard–Holstein model at low electron densities. By tuning electron–phonon coupling and Hubbard repulsion\, we distinguish polaron and bipolaron liquids. While both are metallic\, the polaron liquid exhibits spectral weight up to the Fermi energy\, whereas the bipolaron liquid shows a gap set by the bipolaron binding energy\, suggesting that ARPES can identify liquids of preformed pairs. The bipolaron liquid is well approximated by a gas of hard-core bosons in momentum space [1]. \nTwo-electron coincidence spectra reveal distinct energy and momentum signatures for electrons emitted from the same versus different pairs. These generic fingerprints provide a route to detect pairing and distinguish coherent from incoherent pairs [2].  The pair binding energy can be read off directly from the 2eARPES intensity map when defined as a functiopn of the two distinct frequencies of ejected  photoelectrons. [3] \n  \n[1] K. Kovac\, A. Nocera\,  A.  Damascelli\,  J. Bonca\, and M. Berciu\, Phys. Rev. Lett. 134\, 096502 (2025). \n[2] J. Bonca\,  A.  Damascelli\,  M. Berciu\, under review. \n[3] J. Bonca\,  A. Nocera\, A.  Damascelli\,  M. Berciu\, in preparation.
URL:https://qmi.miffanytark.com/event/cm-seminar-signature-of-preformed-pairs-in-angle-resolved-two-electron-coincidence-photoemission-janez-bonca-university-of-ljubljana/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260205T100000
DTEND;TZID=America/Vancouver:20260205T110000
DTSTAMP:20260127T192756Z
CREATED:20260127T192756Z
LAST-MODIFIED:20260127T192756Z
UID:9130-1770285600-1770289200@qmi.miffanytark.com
SUMMARY:CM Seminar: Topological Landau Theory\, Joseph Maciejko\, University of Alberta
DESCRIPTION:Speaker: Joseph Maciejko\, University of Alberta \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Topological Landau Theory \nAbstract: I will discuss a notion of topology “hidden” in Landau’s theory of phase transitions. When the order parameter comprises several components in the same irreducible representation of symmetry\, it can possess a nontrivial topology and acquire a Berry phase under the variation of thermodynamic parameters. To illustrate this idea\, I will focus on the superconducting phase transition of an electronic system with tetragonal symmetry and a two-component order parameter. From the time-dependent Ginzburg-Landau equation in the adiabatic limit\, we find that the order parameter acquires a Berry phase after a cyclic evolution of parameters. I will discuss two concrete models — one preserving time-reversal symmetry and one breaking it — and show that the nontrivial topology of the order parameter originates from thermodynamic analogs of gapless Dirac and Weyl points in the phase diagram. Finally\, I will propose an experimental realization of a thermodynamic Dirac point in chiral superconductors under strain\, and its detectable signature in the Josephson effect\, the geometry of vortices\, and the upper critical field.
URL:https://qmi.miffanytark.com/event/cm-seminar-topological-landau-theory-joseph-maciejko-university-of-alberta/
CATEGORIES:CM Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260129T100000
DTEND;TZID=America/Vancouver:20260129T110000
DTSTAMP:20260122T180317Z
CREATED:20260122T180317Z
LAST-MODIFIED:20260122T180317Z
UID:9122-1769680800-1769684400@qmi.miffanytark.com
SUMMARY:CM Seminar: Chiral Spin-Split Magnons in the Metallic Altermagnet CrSb\, Ashutosh Singh\, UBC
DESCRIPTION:Speaker: Ashutosh Singh\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: I will begin with a pedagogical overview of the recently identified magnetic class known as altermagnets\, placing them in context alongside conventional ferromagnets and antiferromagnets. I will then present my research on investigating chiral magnons in the metallic altermagnet CrSb. This will include a discussion of the experimental challenges associated with probing magnons in metallic systems and the strategies used to overcome them. Finally\, I will share results from polarized neutron diffraction and inelastic neutron scattering experiments on CrSb and introduce a new approach for determining chiral magnon splitting. \n\nRef:   [[2511.16086] Chiral Spin-Split Magnons in the Metallic Altermagnet CrSb\n          Emerging Research Landscape of Altermagnetism\, Libor Šmejkal\, Jairo Sinova and Tomas Jungwirth\, Phys. Rev. X 12\, 040501
URL:https://qmi.miffanytark.com/event/cm-seminar-chiral-spin-split-magnons-in-the-metallic-altermagnet-crsb-ashutosh-singh-ubc/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260115T100000
DTEND;TZID=America/Vancouver:20260115T110000
DTSTAMP:20260108T010237Z
CREATED:20260108T010237Z
LAST-MODIFIED:20260108T010237Z
UID:9103-1768471200-1768474800@qmi.miffanytark.com
SUMMARY:[Cancelled] CM Seminar: Topological and Correlated Phases in Thin Films of Cadmium Arsenide\, Susanne Stemmer\, University of California Santa Barbara
DESCRIPTION:[This event was cancelled]\nSpeaker: Dr. Susanne Stemmer\, Materials Department\, University of California\, Santa Barbara \nTime: [This event was cancelled] \nLocation: BRIM 311 \nAbstract: Bulk cadmium arsenide (Cd3As2) hosts topologically non-trivial bands in its electronic structure.  In thin films\, it can be engineered to a variety of new topological phases.  In this talk\, we will discuss topological and correlated insulator states in high-quality quantum wells of Cd3As2\, which we grow by molecular beam epitaxy.  Using Landau level spectroscopy\, we show that the films transition to a two-dimensional topological insulator phase at quantum well thicknesses around 20 nm.  At lower thicknesses\, the topological gap closes and reopens as a trivial gap.  An in-plane Zeeman magnetic field induces a topological phase transition to a 2D Weyl semimetal phase\, which shows a well-developed odd-integer quantum Hall effect under a small perpendicular magnetic field.  We show that new types of insulators appear near the critical thickness.  Using transport measurements\, we identify these new insulators as hole and electron Wigner solids\, respectively\, that form spontaneously at zero magnetic field.  Hysteresis and voltage fluctuations point to domain motion across the pinning potential and disappear at finite temperature as thermal fluctuations overcome the potential.  We discuss the interplay of topology\, electron correlations\, and spin-orbit coupling that gives rise to these novel insulating states. \nBio: Dr. Susanne Stemmer is Professor of Materials at the University of California\, Santa Barbara. She did her doctoral work at the Max-Planck Institute for Metals Research in Stuttgart (Germany) and received her degree from the University of Stuttgart.  Her current research interests include scanning transmission electron microscopy techniques\, molecular beam epitaxy\, and topological materials. Honors include election to Fellow of the American Ceramic Society\, Fellow of the American Physical Society\, Fellow of the Materials Research Society\, Fellow of the Microscopy Society of America\, and a Vannevar Bush Faculty Fellowship of the U.S. Department of Defense.
URL:https://qmi.miffanytark.com/event/cm-seminar-topological-and-correlated-phases-in-thin-films-of-cadmium-arsenide-susanne-stemmer-university-of-california-santa-barbara/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20260108T100000
DTEND;TZID=America/Vancouver:20260108T110000
DTSTAMP:20260105T182513Z
CREATED:20260105T182513Z
LAST-MODIFIED:20260105T182513Z
UID:9098-1767866400-1767870000@qmi.miffanytark.com
SUMMARY:CM Seminar: Materials Engineering of Superconductors: Challenges and transformative opportunities in superconductor vortex physics\, Dr. Serena Eley\, the University of Washington
DESCRIPTION:Speaker: Dr. Serena Eley\, the University of Washington \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: In superconductors\, the motion of vortices introduces unwanted dissipation that is disruptive to applications\, for example\, limiting the current-carrying capacity in wires and causing energy losses in microwave circuits.  Fortunately\, material defects can immobilize vortices\, acting as vortex pinning centers\, which engenders dramatic improvements in superconductor material properties and device operation. This has motivated decades of research into developing methods of tailoring the disorder landscape in superconductors to increase the strength of vortex pinning. Yet efficacious materials engineering still eludes us. The electromagnetic properties of real (disordered) superconducting materials cannot yet be reliably predicted\, such that designing superconductors for applications remains a largely inefficient process of trial and error.   In this talk\, I will discuss major open questions in vortex physics and our efforts to understand the complex interplay between vortex elasticity\, vortex-vortex interactions\, and material disorder.  I will cover results from studies of a wide variety of materials\, specifically discussing the effects of incorporating artificial pinning centers and anisotropy on the critical current\, thermally-activated vortex motion (creep)\, and vortex phases. Lastly\, I will present our work towards answering two of the major open questions in vortex physics — determining the ceiling for the critical current density and the minimum achievable rate of thermally activated vortex motion. Understanding these limitations provides new clues about the interplay between material parameters and vortex dynamics as well as how to engineer materials with slow creep. \nBio: Dr. Serena Eley is an Assistant Professor of Electrical and Computer Engineering at the University of Washington in Seattle\, WA. She has received numerous honors\, including a National Science Foundation CAREER Award\, a Cottrell Scholars Award\, the American Institute of Physics Joseph A. Johnson Award\, and recognition as an RCSA Scialog Quantum Matter and Information Fellow. She earned her B.S. in physics from the California Institute of Technology and then conducted research at the International Superconductivity Technology Center in Tokyo as a Henry Luce Scholar before completing her Ph.D. in physics at the University of Illinois Urbana–Champaign. Her dissertation\, which earned the John Bardeen Award\, investigated proximity effects and vortex dynamics in nanostructured superconductor–normal‑metal arrays\, revealing behavior that deviates from conventional proximity effect theories. Following her doctoral work\, Dr. Eley conducted research at Sandia National Laboratories on silicon-based spin‑qubit devices\, at Los Alamos National Laboratory on vortex dynamics in superconductors\, and later served as an Assistant Professor of Physics at the Colorado School of Mines. Today\, her research group explores the complex interactions among disorder\, thermal energy\, spin\, and charge in quantum materials and devices\, with a focus on superconductivity\, magnetism\, vortex and skyrmion dynamics\, energy‑loss mechanisms in superconducting circuits\, and spintronics.
URL:https://qmi.miffanytark.com/event/cm-seminar-materials-engineering-of-superconductors-challenges-and-transformative-opportunities-in-superconductor-vortex-physics-dr-serena-eley-the-university-of-washington/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251204T100000
DTEND;TZID=America/Vancouver:20251204T110000
DTSTAMP:20250917T170612Z
CREATED:20250917T170612Z
LAST-MODIFIED:20250917T170612Z
UID:8976-1764842400-1764846000@qmi.miffanytark.com
SUMMARY:CM Seminar: The revival of Fe-based superconductors: cascades of screening processes and their implications\, Heike Pfau\, Penn State University
DESCRIPTION:Speaker: Heike Pfau\, Penn State University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Understanding how renormalized quasiparticles emerge in strongly correlated electron materials provides a challenge for both experiment and theory. It has been predicted that distinctive spin and orbital screening mechanisms drive this process in multiorbital materials with strong Coulomb and Hund’s interactions. In this talk I will focus on hole-doped iron-based superconductors AFe2As2 (A=Rb\,Cs)\, which are the most correlated members of this material class with large effective masses and strongly renormalized band dispersions. It is currently debated which role electronic correlations play in the complex phase diagrams of iron-based materials\, which contain unconventional superconducting\, nematic\, and magnetic phases as well as strange metal behavior. \nIn our angle-resolved photoemission spectroscopy (ARPES) study\, we observe the existence of two screening processes. The emergence of low-energy Fe 3dxy quasiparticles at low temperatures is tied to spin screening. A second process changes the spectral weight at high energies up to room temperature. Supported by material-specific and model calculations\, we propose that orbital screening of Fe 3d atomic excitations is responsible for it. These two cascading screening processes drive the temperature evolution from a bad metal to a correlated Fermi liquid [1\,2]. \n\n[1] M-H. Chang et al.\, Nature Comm. 15\, 9958 (2024). \n[2] M-H. Chang et al.\, Commun. Mater 6\, 157 (2025).
URL:https://qmi.miffanytark.com/event/cm-seminar-meigan-aronson-ubc/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251127T100000
DTEND;TZID=America/Vancouver:20251127T110000
DTSTAMP:20250917T170826Z
CREATED:20250917T170826Z
LAST-MODIFIED:20250917T170826Z
UID:8979-1764237600-1764241200@qmi.miffanytark.com
SUMMARY:CM Seminar: Towards One Dimensional Heavy Fermions\, Meigan Aronson\, UBC
DESCRIPTION:Speaker: Meigan Aronson\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Strong correlations between conduction electrons and magnetic moments reflect the competition between moment instabilities and magnetic order. Investigations of the resulting collective phases and complex phase diagrams in 3D compounds continue to reveal new behaviors\, although similar efforts on 1D systems remain very limited due to a lack of suitable materials. We present here experimental evidence for 1D excitations in Ti4MnBi2\, a moderately correlated metal consisting of well-separated chains of spin S = 1/2 moments. Inelastic neutron scattering (INS) measurements complemented by DMRG calculations show that Ti4MnBi2 is well described by the frustrated J1- J2 XXZ Hamiltonian\, displaying a continuum of spinon excitations based on an underlying AF ↑↑↓↓ modulation of the Ising-like Mn moments along the chain. This is evidence for the one- dimensionality of the Mn subsystem. Fermi liquid behavior is observed in both the specific heat and electrical resistivity at low temperatures\, indicating that the conduction electrons are three-dimensional\, with magnetic correlations similar in strength to those found in metallic cuprates and ruthenates. \n\nUsing a combination of inelastic neutron scattering measurements and DMRG calculations\, we explore the phase diagram of Ti4MnBi2 as a function of magnetic fields transverse to the chain direction. Highlights include the collapse of the underlying antiferromagnetic phase at a quantum critical point (QCP)\, and the emergence of magnon pair excitations at the highest fields. We discuss the possible role of Kondo coupling of the Mn moments to the conduction electrons in determining the lifetimes of the spinons and magnons\, and in restructuring their excitations near the AF QCP.
URL:https://qmi.miffanytark.com/event/cm-seminar-meigan-aronson-ubc-2/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251120T100000
DTEND;TZID=America/Vancouver:20251120T110000
DTSTAMP:20250917T170543Z
CREATED:20250917T170543Z
LAST-MODIFIED:20250917T170543Z
UID:8974-1763632800-1763636400@qmi.miffanytark.com
SUMMARY:CM Seminar: Open Quantum System Theory\, Kyle Monkman\, UBC
DESCRIPTION:Speaker: Open Quantum System Theory\, Kyle Monkman\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Non-unitary operations have tremendous potential for use in quantum technology. On the one hand\, they can be used to describe the imperfections of experiments which are not fully isolated from the environment. They also describe operations which are necessary for quantum information technology such as qubit-reset\, mixed-state preparation and autonomous quantum error correction. \n\n\nIn this talk\, I will discuss emerging ideas in open system theory. Firstly\, I will introduce the Lindblad master equation and non-Hermitian Hamiltonians as effective descriptions of the environmental coupling. This non-Hermitian description naturally gives rise to an open-system topological invariant\, the subject of recent theoretical debate. Secondly\, I will introduce a bath model that goes beyond the simplified Lindblad and non-Hermitian descriptions. This may have applications as a spectrally dependent switch\, which implements decay processes for systems with energies in a fixed range. Lastly\, I will discuss my future plans to determine general bounds on autonomous quantum error correction.\n\n\n\nI would also like to briefly discuss a separate initiative I helped to develop called “Learning Together.” This program was designed to create space at QMI for open\, relational dialogue on historical\, cultural\, and equity-related issues.
URL:https://qmi.miffanytark.com/event/cm-seminar-kyle-monkman-ubc/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251113T100000
DTEND;TZID=America/Vancouver:20251113T110000
DTSTAMP:20250917T170445Z
CREATED:20250917T170445Z
LAST-MODIFIED:20250917T170445Z
UID:8972-1763028000-1763031600@qmi.miffanytark.com
SUMMARY:CM Seminar: Field emission as a tool for material characterization in the tunneling regime\, Anthony Ayari\, CNRS
DESCRIPTION:Speaker: Anthony Ayari\, CNRS \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Field emission as a tool for material characterization in the tunneling regime  \nAbstract: Vacuum electron sources have a long history dating back to the end of the nineteenth century\, and have been at the root for many revolutionary developments\, such as the advent of telecommunications and the computer. Today\, these sources are indispensable for electron microscopy and X-ray generation. This presentation will focus on the most quantum of these sources\, namely field emission sources\, which provide electron beams with the highest brilliance and coherence. The physical phenomenon at the heart of field emission is the tunnel effect. This phenomenon was theorized almost 100 years ago\, first in chemistry by Friedrich Hund\, then by Oppenheimer for the ionization of atoms\, Fowler and Nordheim for field emission\, and finally Gurney\, Condon\, and Gamow for the alpha decay\, all within the space of a year. None of them received the Nobel Prize for the microscopic tunnel effect.  I will take the opportunity of this year’s Nobel prize in physics attributed to the discovery of macroscopic quantum mechanical tunneling to revisit microscopic tunneling. I will review the historical equations of the field and show why field emission has been so far unable to give accurate measurements of the work function of materials. I will also illustrate how field emission can be used to study femtosecond tunneling phenomena and characterize the electronic\, thermal and mechanical properties of nano-objects.
URL:https://qmi.miffanytark.com/event/cm-seminar-anthony-ayari-cnrs/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251106T100000
DTEND;TZID=America/Vancouver:20251106T110000
DTSTAMP:20251105T050746Z
CREATED:20251105T050746Z
LAST-MODIFIED:20251105T050746Z
UID:9029-1762423200-1762426800@qmi.miffanytark.com
SUMMARY:CM Seminar: Optical quantum computing with GKP states\, Sacha Kocsis\, Xanadu
DESCRIPTION:Speaker: Sacha Kocsis\, Xanadu \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Optical quantum computing with GKP states \nTopic: Xanadu is a quantum computing company founded in Toronto in 2016 with the goal of building fault-tolerant quantum computers. I will give an overview of Xanadu’s recent hardware milestones\, and an introduction to Xanadu’s strategy for fault-tolerant quantum computing using optical GKP states. Finally\, I will focus on our most recent hardware demonstration [1] from earlier this year\, in which we generated and measured GKP states showing features necessary for fault-tolerance\, using a scalable integrated platform.  \n  \n[1] M.V. Larsen et al.\, Nature 642\, 587 (2025)
URL:https://qmi.miffanytark.com/event/cm-seminar-optical-quantum-computing-with-gkp-states-sacha-kocsis-xanadu/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251030T100000
DTEND;TZID=America/Vancouver:20251030T110000
DTSTAMP:20250917T170046Z
CREATED:20250917T170046Z
LAST-MODIFIED:20250917T170046Z
UID:8970-1761818400-1761822000@qmi.miffanytark.com
SUMMARY:CM Seminar: Chris Woodgate\, Bristol University
DESCRIPTION:CM Seminar pages are updated weekly and closer to the event! Watch this space for more information. \nSpeaker: Chris Woodgate\, Bristol University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: 
URL:https://qmi.miffanytark.com/event/cm-seminar-chris-woodgate-bristol-university/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251023T100000
DTEND;TZID=America/Vancouver:20251023T110000
DTSTAMP:20250917T165958Z
CREATED:20250917T165958Z
LAST-MODIFIED:20250917T165958Z
UID:8968-1761213600-1761217200@qmi.miffanytark.com
SUMMARY:CM Seminar: Charles Antoine\, CNRS/Université Pierre et Marie Curie
DESCRIPTION:CM Seminar pages are updated weekly and closer to the event! Watch this space for more information. \nSpeaker: Charles Antoine\, CNRS/Université Pierre et Marie Curie \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: 
URL:https://qmi.miffanytark.com/event/cm-seminar-charles-antoine-cnrs-universite-pierre-et-marie-curie/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251016T100000
DTEND;TZID=America/Vancouver:20251016T110000
DTSTAMP:20250917T165714Z
CREATED:20250917T165714Z
LAST-MODIFIED:20250917T165714Z
UID:8965-1760608800-1760612400@qmi.miffanytark.com
SUMMARY:CM Seminar: Quantum Field\, Pictorial Field: Interferences and Translations\, Nadia Lichtig\, Quantum Studio ArtXscience
DESCRIPTION:Note: this event is part of the Quantum Studio program sponsored by the French Consulate. Please join us\, and interact with Nadia during her residency at QMI. \nSpeaker: Nadia Lichtig\, Quantum Studio ArtXscience \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Quantum Field\, Pictorial Field: Interferences and Translations \nAbstract: This lecture explores the influence of quantum physics on an artistic practice in pictorial and sonic gestures. Rather than illustrating scientific concepts\, it examines how notions such as indeterminacy\, superposition\, diffraction\, and entanglement become aesthetic operators. These principles open the way to a conception of the pictorial and the sonic as relational fields\, interwoven with interferences and continuous translations\, where furtive painting emerges as a mode of appearance that resists capture and insists on the fragmentary – proposing an aesthetics of opacity and survival rather than representation.
URL:https://qmi.miffanytark.com/event/cm-seminar-nadia-lichtig-quantum-studio-artxscience/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20251002T100000
DTEND;TZID=America/Vancouver:20251002T110000
DTSTAMP:20250917T165442Z
CREATED:20250917T165442Z
LAST-MODIFIED:20250917T165442Z
UID:8961-1759399200-1759402800@qmi.miffanytark.com
SUMMARY:CM Seminar: Interplay between metal-to-Insulator-like transition and superconductivity in Ga-doped Re3Ge7 single crystals\, Eundeok Mun\, SFU
DESCRIPTION:Speaker: Eundeok Mun\, SFU \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Interplay between metal-to-Insulator-like transition and superconductivity in Ga-doped Re3Ge7 single crystals \nAbstract: Growing single crystals of Re3Ge7 allows for detailed investigations into its complex electronic behavior\, revealing it as a material with an emerging unconventional charge ordered state and superconductivity by external pressure and doping. To further explore characteristics\, we have synthesized single crystals of Ga-doped Re3Ge7 and performed magnetization\, electrical resistivity\, specific heat\, and thermoelectric power measurements. In this talk I will share new findings in this system. The obtained x-T phase diagram of Re3(GaxGe1-x)7 exhibits a close relationship between metal-to-insulator-like (MIL) transition and superconducting transition temperature. Interestingly\, superconductivity emerges when the MIL transition becomes a maximum and the maximum superconducting transition temperature can be achieved when the MIL transition is suppressed\, basically forming a superconducting dome. The upper critical field (Hc2) measurements exhibit that Hc2 curves are well described by the Ginzburg-Landau equation in the right side of the superconducting dome. On the other hand\, the Hc2 curve in the left side of the dome deviates from the Ginzburg-Landau model at low temperatures\, where the superconductivity and MIL transition coexists. Furthermore\, samples showing superconductivity indicate a re-entrance of zero-resistance state (peak effect) under external magnetic field\, providing a good opportunity to study complex vortex state.
URL:https://qmi.miffanytark.com/event/cm-seminar-eundeok-mun-sfu/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250925T100000
DTEND;TZID=America/Vancouver:20250925T110000
DTSTAMP:20250917T165137Z
CREATED:20250917T165137Z
LAST-MODIFIED:20250917T165137Z
UID:8956-1758794400-1758798000@qmi.miffanytark.com
SUMMARY:CM Seminar: Superconductivity in twisted bilayer WSe2\, Cory Dean\, Columbia University
DESCRIPTION:Speaker: Cory Dean\, Columbia University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Superconductivity in twisted bilayer WSe2 \nAbstract: Superconductivity in twisted bilayer and twisted trilayer graphene results from an interplay between interlayer coupling and a moiré superlattice that gives rise to low-energy flat bands with strong correlations. Similar flat bands have been explored in lattice-mismatched and or twisted heterostructures of other two-dimensional materials beyond graphene such as transition metal dichalcogenides (TMDs). However\, despite a wide range of correlated phenomenon robust demonstration of superconductivity in the TMDs remained absent and its possibility an open question. In my talk I will present our recent observation of superconductivity in twisted bilayer WSe2\, appearing adjacent to a magnetic ordering state.  The ability to vary the twist angle provides a unique capability to modulate the interacting strength in this system and in recent experiments we observe a systematic evolution of the magnetic and superconducting phases.  I will discuss our current understanding of the phase space of correlated states in this moire system\, and how this relates to conventional examples of unconventional superconductors.
URL:https://qmi.miffanytark.com/event/cm-seminar-cory-dean-columbia-university/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250919T130000
DTEND;TZID=America/Vancouver:20250919T140000
DTSTAMP:20250917T163917Z
CREATED:20250917T163917Z
LAST-MODIFIED:20250917T163917Z
UID:8951-1758286800-1758290400@qmi.miffanytark.com
SUMMARY:Special CM Seminar: Rhombohedral graphene: a tunable platform for unconventional superconductivity and collective modes\, Etienne Lantagne-Hurtubise\, Université de Sherbrooke
DESCRIPTION:Speaker: Etienne Lantagne-Hurtubise\, Université de Sherbrooke \nTime: 1:00-2:00pm \nLocation: BRIM 311 \nAbstract: Rhombohedral graphene multilayers are clean and highly-tunable 2D materials that showcase a multitude of symmetry-broken insulating\, metallic and superconducting phases at low temperatures. Their rich phase diagram can further be modified via proximity to transition metal dichalcogenides such as WSe2\, which induce spin-orbit coupling in the graphene layers and lead to a dramatic enhancement of superconductivity. I will first present Hartree-Fock phase diagrams for these systems\, highlighting a spin-canted magnetic phase consistent with recent nano-SQUID experiments. I will then describe a pairing mechanism based on the low-energy collective spin modes (or magnons) associated with spin canting\, which could explain spin-orbit-enhanced superconductivity in these systems. Finally\, I will show how the valley-polarized superconductors recently reported in rhombohedral tetra- and penta-layer graphene could host superconducting collective modes accessible in linear optical spectroscopy.
URL:https://qmi.miffanytark.com/event/special-cm-seminar-rhombohedral-graphene-a-tunable-platform-for-unconventional-superconductivity-and-collective-modes-etienne-lantagne-hurtubise-universite-de-sherbrooke/
CATEGORIES:CM Seminar
ATTACH;FMTTYPE=:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250403T080000
DTEND;TZID=America/Vancouver:20250403T170000
DTSTAMP:20250115T235034Z
CREATED:20250115T235034Z
LAST-MODIFIED:20250115T235034Z
UID:8505-1743667200-1743699600@qmi.miffanytark.com
SUMMARY:CM Seminar: Complexity in Josephson Matter\, Charles Marcus\, University of Washington
DESCRIPTION:Speaker: Charles Marcus\, University of Washington \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Hybrid superconductors-semiconductor heterostructures allow voltage control of carrier density in superconducting systems. We use these materials to investigate novel gate-controlled arrays of Josephson junctions in a variety of geometries\, examining the interplay of quantum coherence\, Coulomb interaction\, and frustration. Using the example of the dice lattice\, I will draw connections between protected quantum information and quantum phase transitions in two dimensions.
URL:https://qmi.miffanytark.com/event/cm-seminar-charles-marcus-university-of-washington/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250313T100000
DTEND;TZID=America/Vancouver:20250313T110000
DTSTAMP:20240903T221219Z
CREATED:20240903T221219Z
LAST-MODIFIED:20240903T221219Z
UID:8089-1741860000-1741863600@qmi.miffanytark.com
SUMMARY:CM Seminar: Electron-hole atomic double layers: towards high-temperature exciton condensation\, Jie Shan\, Cornell University
DESCRIPTION:Speaker: Jie Shan\, Cornell University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTopic: Electron-hole atomic double layers: towards high-temperature exciton condensation \nAbstract: Excitons\, bound electron-hole pairs\, in semiconductors are bosons that can form condensates. With a much smaller mass than atoms\, they have been predicted to condense at a much higher temperature scale. Although the concept has been understood for more than sixty years\, experimental realization of exciton condensates or superfluids has remained challenging. In this talk\, I will discuss our recent efforts in creating a high-density equilibrium exciton fluid in atomic double layers made of semiconducting transition metal dichalcogenides. I will present results from both thermodynamics and transport measurements that establish high-temperature excitonic insulators. I will also discuss the physics of doped excitonic insulators that can support a Bose-Fermi mixture and an equilibrium trion fluid. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-jie-shan-cornell-university/
CATEGORIES:CM Seminar
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