R. G. Herb Condensed Matter Seminars

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

Monday, January 29th, 2018

No events scheduled

Tuesday, January 30th, 2018

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Wednesday, January 31st, 2018

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Thursday, February 1st, 2018

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

No events scheduled