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This Week at Physics

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Events During the Week of January 28th through February 4th, 2018

Monday, January 29th, 2018

Council Meeting
Council Meeting
Time: 4:00 pm
Place: 2314 Chamberlin Hall
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Tuesday, January 30th, 2018

No events scheduled

Wednesday, January 31st, 2018

Department Meeting
Department Meeting
Time: 12:15 pm
Place: 5310 Chamberlin Hall
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Thursday, February 1st, 2018

R. G. Herb Condensed Matter Seminar
Supercurrent in the quantum Hall regime
Time: 10:00 am
Place: chamberlin 5310
Speaker: Gleb Finkelstein, Duke University
Abstract: One of the promising routes towards creating novel topological states and excitations is to combine superconductivity and quantum Hall (QH) effect. However, signatures of superconductivity in the QH regime remain scarce, and a superconducting current through a QH weak link has so far eluded experimental observation. By utilizing high mobility graphene/boron nitride heterostructures we demonstrate the existence of a novel type of supercurrent-carrying states in a QH regime at magnetic fields as high as 2 Tesla. At low magnetic fields, devices demonstrate the Fraunhoffer pattern and Fabri-Perot oscillations, confirming their uniformity and ballisticity. In the QH regime, when Landau quantization is fully developed, regions of superconductivity can be observed on top of the conventional QH fan diagram. The measured supercurrent is very small, on a few nA scale, and periodic in magnetic field. We discuss possible mechanisms that could mediate supercurrent along the QH edge states.
Host: Alex Levchenko
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Friday, February 2nd, 2018

Physics Department Colloquium
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: Ilya Nemenman, Emory University
Abstract: tbd
Host: Vavilov
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