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DTSTAMP:20260128T142809
DTSTART;TZID=America/Detroit:20260204T143000
DTEND;TZID=America/Detroit:20260204T153000
SUMMARY:Workshop / Seminar:Student Number Theory: Stable conjugacy and transfer of tori
DESCRIPTION:If G is a connected reductive linear algebraic group defined over F\, a non-Archimedean local field\, then all of its maximal tori are conjugate over the separable closure of F. But when are two maximal tori of G rationally conjugate\, i.e. conjugate by an element of G(F)? Are there circumstances under which we say what it means for maximal tori in two different groups to be conjugate? In this talk\, we will endeavor to answer these and some related questions. Along the way\, we will go over a small example in detail\, and we will review some properties of Galois cohomology as well as the notion of what it means for two connected reductive groups to be inner twists of each other.
UID:144705-21895749@events.umich.edu
URL:https://events.umich.edu/event/144705
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3088
CONTACT:
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DTSTAMP:20260202T095545
DTSTART;TZID=America/Detroit:20260204T150000
DTEND;TZID=America/Detroit:20260204T160000
SUMMARY:Workshop / Seminar:Department Colloquium | Supersonic Currents to Cavity-Altered Superconductors
DESCRIPTION:I will discuss the use of scan probe microscopy to gain microscopic insight into two separate quantum phenomena in solids.\n\nIn the first experiment\, we explore how electrons in ultra-clean solids can behave as a viscous fluid\, enabling transport far from the textbook ohmic or ballistic regimes. I will discuss a bilayer-graphene electronic de Laval nozzle that accelerates carriers to supersonic speeds\, producing a viscous electron shock. Discontinuities in transport and local potential flattening observed by Kelvin probe microscopy are consistent with a compressible\, hydrodynamic flow that breaks the electronic sound barrier\, opening a path to intrinsically nonlinear devices that exploit shocks.\n\nIn the second experiment\, I will discuss how we can affect superconductivity by engineering a material’s electromagnetic environment. Using a “dark” hyperbolic cavity formed by hexagonal boron nitride interfaced with the molecular superconductor κ-(BEDT-TTF)₂Cu[N(CN)₂]Br (κ-ET)\, we realize resonant coupling between hBN hyperbolic modes and a molecular vibration implicated in pairing. We use magnetic-force microscopy to detect  the Meissner response at the interface of the two materials. We observe a marked suppression of superfluid density at the interface—an effect absent in non-resonant controls.\n\nBio: Abhay Pasupathy is a professor in the physics department at Columbia University (since 2009)\, and is also a group leader in the Condensed Matter and Materials Science Division at Brookhaven National Laboratory (since 2020). His research interests are in understanding the emergent properties of quantum materials\, using microscopic and spectroscopic tools such as the scanning tunneling microscope\, the atomic force microscope and angle resolved photoemission.
UID:144218-21894877@events.umich.edu
URL:https://events.umich.edu/event/144218
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Physics,Science
LOCATION:West Hall - 340
CONTACT:
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