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Events on Thursday, November 10th, 2022

R. G. Herb Condensed Matter Seminar
Scanning tunneling spectroscopy of unconventional superconductors
Time: 10:00 am - 11:00 am
Place: 5310 Chamberlin
Speaker: Pavlo Sukhachov, Yale
Abstract: Motivated by recent experimental observations of unconventional superconductivity in twisted bilayer and trilayer graphenes, we develop a theory describing the differential conductance between a normal STM tip and a 2D superconductor with an arbitrary gap structure. Our analytical scattering theory accounts for Andreev reflections, which become prominent at larger transmission between the tip and the superconductor. Exploiting the dependence of Andreev reflection on the relative position of the STM tip with respect to the lattice symmetry points, we show that the structure of the superconducting gap can be extracted by combining weak- and strong-tunneling limits of differential conductance. Furthermore, the theory incorporates a tip-induced scattering potential within the 2D material, which allows us to describe subgap resonances.
Host: Alex Levchenko
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Plasma Physics (Physics/ECE/NE 922) Seminar
Let's Talk Fusion Energy
Time: 2:15 pm - 3:30 pm
Place: 1003 Engineering Centers Building, Tong Auditorium
Speaker: U.S. Department of Energy ARPA-E Program Director, et al., U.S. DOE
Abstract: We have a delegation from the Department of Energy and ARPA-E visiting UW Madison, and they are offering a town hall event on Thursday at 2.15 PM. Please see the attached flyer. Everybody is invited to participate. We hope you can attend this important event, which will be an opportunity to discuss recent program developments to accelerate the path to commercial fusion energy. Scott Hsu, DOE Lead Fusion Coordinator, Office of the Under Secretary for Science and Innovation Ahmed Diallo, Program Director, ARPA-E Sam Wurzel, Technology-to-Market Advisor, ARPA-E Katharine Greco, Fellow, ARPA-E Ed Cruz, Tech SETA, ARPA-E (Booz Allen Hamilton) Ziaur Rahman, Tech SETA, ARPA-E (Booz A t at the University of Maryland – College Park
Host: Oliver Schmitz
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Astronomy Colloquium
The Roman Galactic Exoplanet Survey
Time: 3:30 pm - 4:30 pm
Place: 4421 Sterling Hall
Speaker: Prof. Scott Gaudi, Ohio State University
Abstract: I summarize the scientific motivation and properties of the Roman Galactic Exoplanet Survey (RGES), one possible realization of the Galactic Bulge Time Domain Survey, which itself is one of three core community surveys that will be carried out with NASA’s Nancy Roman Space Telescope (Roman). The notional RGES survey will consist of photometric monitoring of a ~2 sq. degree area toward the Galactic bulge every 15 minutes in a wide, 1-2 micron filter in order to search for cold planets using gravitational microlensing. The survey will consist of six ~72-day seasons, with most of the seasons being concentrated early and late in the nominal 5-year Roman prime mission. I will summarize the expected yield of the RGES survey, and then describe future activities in preparation for, and further definition of, the Galactic Bulge Time Domain Survey.
Host: Ke Zhang
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