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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-4675
DTSTART:20180201T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T040258Z
LAST-MODIFIED:20171029T004828Z
LOCATION:chamberlin 5310
SUMMARY:Supercurrent in the quantum Hall regime\, R. G. Herb Condensed
  Matter Seminar\, Gleb Finkelstein\, Duke University
DESCRIPTION:One of the promising routes towards creating novel topolog
 ical states and excitations is to combine superconductivity and quantu
 m Hall (QH) effect. However\, signatures of superconductivity in the Q
 H regime remain scarce\, and a superconducting current through a QH we
 ak link has so far eluded experimental observation. By utilizing high 
 mobility graphene/boron nitride heterostructures we demonstrate the ex
 istence of a novel type of supercurrent-carrying states in a QH regime
  at magnetic fields as high as 2 Tesla. At low magnetic fields\, devic
 es 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 measure
 d supercurrent is very small\, on a few nA scale\, and periodic in mag
 netic field. We discuss possible mechanisms that could mediate supercu
 rrent along the QH edge states.
URL:https://www.physics.wisc.edu/events/?id=4675
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