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X-WR-CALNAME:Stewart Blusson Quantum Matter Institute
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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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DTSTART;TZID=America/Vancouver:20260924T100000
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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
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DTSTART;TZID=America/Vancouver:20261008T100000
DTEND;TZID=America/Vancouver:20261008T110000
DTSTAMP:20261005T181437Z
CREATED:20261005T181437Z
LAST-MODIFIED:20261005T181437Z
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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
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20261015T100000
DTEND;TZID=America/Vancouver:20261015T110000
DTSTAMP:20261014T223316Z
CREATED:20261013T170104Z
LAST-MODIFIED:20261014T223316Z
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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
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