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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
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DTSTART;TZID=America/Vancouver:20260115T100000
DTEND;TZID=America/Vancouver:20260115T110000
DTSTAMP:20260108T010237Z
CREATED:20260108T010237Z
LAST-MODIFIED:20260108T010237Z
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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
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DTSTART;TZID=America/Vancouver:20260122T100000
DTEND;TZID=America/Vancouver:20260122T110000
DTSTAMP:20260112T224047Z
CREATED:20260112T224047Z
LAST-MODIFIED:20260112T224047Z
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SUMMARY:QMI Meet and Mingle
DESCRIPTION:Come join us for a chance to have an informal chat with colleagues and share ideas\, questions\, and new results. Snacks and coffee will be served!
URL:https://qmi.miffanytark.com/event/qmi-meet-and-mingle/
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DTSTART;TZID=America/Vancouver:20260129T100000
DTEND;TZID=America/Vancouver:20260129T110000
DTSTAMP:20260122T180317Z
CREATED:20260122T180317Z
LAST-MODIFIED:20260122T180317Z
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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
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