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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=:
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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
ATTACH;FMTTYPE=:
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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=:
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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=:
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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=:
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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=:
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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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250306T100000
DTEND;TZID=America/Vancouver:20250306T110000
DTSTAMP:20250221T001217Z
CREATED:20250221T001217Z
LAST-MODIFIED:20250221T001217Z
UID:8697-1741255200-1741258800@qmi.miffanytark.com
SUMMARY:CM Seminar: Signature of preformed pairs in angle-resolved photoemission spectroscopy\, Janez Bonca\, University of Ljubljana
DESCRIPTION:Speaker: Janez Bonca\, University of Ljubljana \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: We use density matrix renormalization group (DMRG) and variational exact diagonalization (VED) to calculate the single-electron removal spectral weight for the Hubbard-Holstein model at low electron densities. Tuning the strength of the electron-phonon coupling and of the Hubbard repulsion allows us to contrast the results for a liquid of polarons versus a liquid of bipolarons. The former shows spectral weight up to the Fermi energy\, as expected for a (uncorrelated) metal. The latter has a gap in its spectral weight\, set by the bipolaron binding energy\, although this is also a (strongly correlated) metal. This difference suggests that angle-resolved photoemission spectroscopy could be used to identify liquids of pre-formed pairs. Furthermore\, we show that the liquid of bipolarons is well approximated by an ensemble of bosons that are hard-core in momentum space\, filling the states inside the Fermi sea but otherwise non-interacting [1]. We have also generalized the calculation to allow for a finite optical phonon dispersion. The spectral function is significantly influenced by the dispersion\, particularly in systems with strong electron-phonon coupling. The sign of the curvature of the phonon band plays a crucial role in the distribution of spectral weight [2]. \nReferences \n• [1] K. Kovaˇc\, A. Nocera\, A. Damascelli\, J. Bonˇca\, and M. Berciu\, to appear in PRL\, arXiv:2409.14490 \n• [2] K. Kovaˇc and J. Bonˇca\, arXiv:2410.11537
URL:https://qmi.miffanytark.com/event/cm-seminar-signature-of-preformed-pairs-in-angle-resolved-photoemission-spectroscopy-janez-bonca-university-of-ljubljana/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250220T100000
DTEND;TZID=America/Vancouver:20250220T110000
DTSTAMP:20240903T220848Z
CREATED:20240903T220848Z
LAST-MODIFIED:20240903T220848Z
UID:8085-1740045600-1740049200@qmi.miffanytark.com
SUMMARY:CM Seminar: Michael Foss-Feig\, Quantinuum
DESCRIPTION:Speaker: Michael Foss-Feig\, Quantinuum \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-michael-foss-feig-quantinuum/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250206T100000
DTEND;TZID=America/Vancouver:20250206T110000
DTSTAMP:20240903T220717Z
CREATED:20240903T220717Z
LAST-MODIFIED:20240903T220717Z
UID:8083-1738836000-1738839600@qmi.miffanytark.com
SUMMARY:CM Seminar: Direct Integration of 2D Materials for Next Generation Electronic Devices Zak Al Balushi\, University of California Berkeley
DESCRIPTION:Speaker: Zak Al Balushi\, University of California Berkeley \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Two-dimensional (2D) semiconductors\, such as molybdenum disulfide (MoS2)\, are emerging as key materials for next-generation electronics\, addressing challenges in the miniaturization of silicon-based technologies. Despite progress in scaling-up 2D materials\, integrating them into functional devices remains challenging\, particularly in the context of three-dimensional integration. In the first part of my talk\, I will present a scalable method for growing high-quality mono- to few-layer MoS2 on large wafers using a spin-on precursor\, molybdenum ethyl xanthate. This approach facilitates the formation of a metastable amorphous molybdenum trisulfide phase\, which we can then be leveraged for direct heterogeneous integration. We thoroughly investigate the growth dynamics and associated versatile features using comprehensive characterization\, reactive force-field molecular dynamics simulations\, and Density Functional Theory. Our method allows precise control over film thickness\, grain size\, and defect density\, yielding wafer-scale monolayer MoS2 with reliable optical properties comparable to as-exfoliated samples. Additionally\, we achieve area-selective formation of MoS2 and the direct deposition of sub-5 nm high-k oxides using atomic layer deposition\, without the need for seeding or surface functionalization. This process enables the fabrication of complex superlattice structures\, top-gated FETs\, and memristor devices\, all from a single-source chemistry. Our findings highlight the versatility of spin-on metal xanthate chemistries for the synthesis and integration of transition metal dichalcogenides (MoS2\, WS2\, NbS2\, ReS2\, etc.)\, paving the way for advanced nanoscale fabrication processes and enhancing the commercial viability of 2D materials in electronics. \nMoreover\, forming heavily doped regions in two-dimensional materials\, like graphene\, are a steppingstone to the design of emergent devices and heterostructures. In the second part of my talk\, I will present a selective-area approach to tune the work-function and carrier density in monolayer graphene by spatially synthesizing sub-monolayer gallium beneath the 2D-solid.  Localized metallic gallium is formed via precipitation from an underlying diamond-like carbon (DLC) film that was spatially implanted with gallium-ions. Controlling the interfacial precipitation process with annealing temperature allows for spatially precise ambipolar tuning of the graphene work-function that remains stable even in ambient conditions. Our theoretical studies corroborated the role of the gallium at the heterointerface on charge transfer and electrostatic doping of the graphene overlayer\, with charge carrier densities from ~ (hole-doped) to  (electron-doped) as measured by in-situ and ex-situ measurements. The extension of this doping scheme to other implantable elements into DLC provides a new means of exploring the physics and chemistry of highly doped overlayed two-dimensional materials. \nFinally\, metalorganic chemical vapor deposition (MOCVD) has become a pivotal technique for developing wafer-scale TMD 2D materials. If time permits\, I will discuss our recent findings on the impact of MOCVD growth conditions on achieving uniform and selective polymorph phase control of MoTe2 over large wafers. We demonstrated the controlled and uniform growth of few-layer MoTe2 in pure 2H\, 1T’\, and mixed-phases at various temperatures on up to 4-inch C-plane sapphire wafers with hexagonal boron nitride templates. At 600oC\, high-quality 2H-MoTe2 was obtained within a narrow temperature window\, verified with absorption and TEM analysis. In addition\, we observed strong exciton-phonon coupling effects in multiwavelength Raman spectroscopy when the excitation wavelength was in resonance with the C-exciton. Our findings indicate that temperature-induced Te vacancies play a crucial role in determining the MoTe2 phase. This study highlights the importance of precise control over the MOCVD growth temperature to engineer the MoTe2 phase of interest for device applications. \n\nAbout the speaker: Zak Al Balushi is an assistant professor in the department of Materials Science and Engineering at University of California\, Berkeley\, and a faculty scientist in the Materials Science Division at the Lawrence Berkeley National Laboratory. Zakaria received his B.S. (2011)\, M.S. (2012) in Engineering Science and his Ph.D. (2017) in Materials Science and Engineering all from The Pennsylvania State University. His early work focused on integration and fabrication of silicon nanowire devices\, then on the growth of group-III nitride semiconductors\, in situ metrology during MOCVD growth\, epitaxial graphene and the discovery and characterization of unconventional low-dimensional materials and heterostructures. Prior to his appointment at the University of California\, Berkeley\, he held two postdoctoral fellowships: the Resnick Prize Fellowship in Applied Physics and Materials Science and the NSF Alliances for Graduate Education and the Professoriate (AGEP) Fellowship both at the California Institute of Technology under the supervision of Professor Harry Atwater. At Caltech\, he focused on the synthesis and characterization of phase transformations in transition metal dichalcogenides 2D materials. At the University of California\, Berkeley\, his research group continues to expand in this area and beyond\, creating new synthesis and integration schemes for emerging low-dimensional materials. He is currently serving on the editorial board of Communications Materials\, is an elected executive committee member for the American Association for Crystal Growth and recently named “Four rising stars who are reshaping nanoscience” by Nature [Nature 608\, S12-S13 (2022)]. He is also a SK Hynix Faculty Fellow\, Society of Hellman Fellow\, a CIFAR Azrieli Global Scholar in Quantum Materials and a recipient of the NSF CAREER and Micron Corporation Early Career Awards in 2022.
URL:https://qmi.miffanytark.com/event/cm-seminar-zak-al-balushi-university-of-california-berkeley/
CATEGORIES:CM Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250130T100000
DTEND;TZID=America/Vancouver:20250130T110000
DTSTAMP:20240903T220549Z
CREATED:20240903T220549Z
LAST-MODIFIED:20240903T220549Z
UID:8081-1738231200-1738234800@qmi.miffanytark.com
SUMMARY:CM Seminar: Connected Network Model for the Mechanical Loss of Amorphous Materials\, Steven Blaber\, UBC
DESCRIPTION:Speaker: Steven Blaber\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: For over 50 years\, the two-level system (TLS) model has stood as the prevailing description of thermal and acoustic properties of amorphous solids. Atomistic modeling shows that TLS are not independent as typically assumed\, but form a sparse\, interconnected network. I will discuss the mechanical loss in amorphous solids based on the nonequilibrium thermodynamics of connected networks\, providing a major advance beyond the quintessential two-level system model\, and revealing new avenues for the study amorphous materials. Amorphous mirror coatings with exceptionally low mechanical loss are critical components in the next generation of gravitational wave detectors. I will also briefly discuss how these results could impact the TLS model for dielectric loss in superconducting qubits. \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-clara-santato-polytechnique-montreal/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20250123T100000
DTEND;TZID=America/Vancouver:20250123T110000
DTSTAMP:20250115T234034Z
CREATED:20250115T234034Z
LAST-MODIFIED:20250115T234034Z
UID:8499-1737626400-1737630000@qmi.miffanytark.com
SUMMARY:CM Seminar: Just-in-time compiling Shor's algorithm with PennyLane and Catalyst\, Olivia Di Matteo\, UBC
DESCRIPTION:Speaker: Olivia Di Matteo\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \n\nAbstract: As quantum computing hardware continues to improve\, so must the tools we use to write quantum algorithms. There is a growing need for more expressive quantum programming languages that enable developers to write code at higher levels of abstraction than quantum circuits. This\, in turn\, necessitates robust and automated compilers that can generate optimized sequences of quantum operations in a scalable way. Such compilers are especially important for algorithms with many interdependent classical and quantum subroutines\, such as Shor’s factoring algorithm. \nIn this talk I will provide a pedagogical introduction to Shor’s algorithm by presenting its implementation at varying levels of abstraction. While its high-level subroutines are straightforward to express\, compilation and optimization incurs a large overhead due to the algorithm’s randomized nature. To that end\, I will highlight on-going work on a fully just-in-time-compiled implementation using PennyLane and Catalyst. I’ll discuss its scaling\, practical resource requirements\, implementation tricks (and unique quirks)\, and the feasibility of executing it on near-term hardware.
URL:https://qmi.miffanytark.com/event/just-in-time-compiling-shors-algorithm-with-pennylane-and-catalyst/
CATEGORIES:CM Seminar
END:VEVENT
BEGIN:VEVENT
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
END:VCALENDAR