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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.", "occurrence_notes":null, "guid":"144705-21895749@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144705", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Student Number Theory Seminar - Department of Mathematics", "group_id":"4906", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21895749 } , "144218-21894877": { "datetime_modified":"20260202T095545", "datetime_start":"20260204T150000", "datetime_end":"20260204T160000", "has_end_time":1, "date_start":"2026-02-04", "date_end":"2026-02-04", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Department Colloquium | Supersonic Currents to Cavity-Altered Superconductors", "occurrence_title":"", "combined_title":"Department Colloquium | Supersonic Currents to Cavity-Altered Superconductors: Abhay Narayan Pasupathy (Columbia University)", "event_subtitle":"Abhay Narayan Pasupathy (Columbia University)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "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\u2019s electromagnetic environment. Using a \u201cdark\u201d hyperbolic cavity formed by hexagonal boron nitride interfaced with the molecular superconductor \u03ba-(BEDT-TTF)\u2082Cu[N(CN)\u2082]Br (\u03ba-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\u2014an 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.", "occurrence_notes":null, "guid":"144218-21894877@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144218", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Physics","Science"], "website":"", "sponsors":[ { "group_name":"Department Colloquia", "group_id":"3804", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21894877 } , "144503-21895433": { "datetime_modified":"20260126T113018", "datetime_start":"20260204T150000", "datetime_end":"20260204T160000", "has_end_time":1, "date_start":"2026-02-04", "date_end":"2026-02-04", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Glassware Painting Social Event", "occurrence_title":"", "combined_title":"Glassware Painting Social Event", "event_subtitle":"", "event_type":"Social \/ Informal Gathering", "event_type_id":"19", "description":"QueST and Centerspace are groups focused on queer community in the sciences. Our events are open to everyone. This is a social painting event using recycled glassware (or small canvases if preferred). 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