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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4474
DTSTART:20170209T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T043033Z
LAST-MODIFIED:20170203T145755Z
LOCATION:5310 Chamberlin
SUMMARY:Two-dimensional epitaxial superconductor-semiconductor heteros
 tructures: A platform for topological superconducting networks\, R. G.
  Herb Condensed Matter Seminar\, Javad Shabani \, City College\, City 
 University of New York
DESCRIPTION:Progress in the emergent field of topological superconduct
 ivity relies on synthesis of new material combining superconductivity\
 , low density\, and spin-orbit coupling. For example\, theory indicate
 s that the interface between a one-dimensional semiconductor with stro
 ng spin orbit coupling and a superconductor hosts Majorana modes with 
 nontrivial topological properties. Recently\, epitaxial growth of Al o
 n InAs nanowires was shown to yield a high quality superconductor-semi
 conductor (S-Sm) system with uniformly transparent interfaces and a ha
 rd induced gap\, indicted by strongly suppressed subgap tunneling cond
 uctance. Here we report the realization of a two-dimensional (2D) InAs
 /InGaAs heterostructure with epitaxial Al\, yielding a planar S-Sm sys
 tem with structural and transport characteristics as good as the epita
 xial wires. The realization of 2D epitaxial S-Sm systems represent a s
 ignificant advance over wires\, allowing extended networks via top-dow
 n processing. Among numerous potential applications\, this new materia
 l system can serve as a platform for complex networks of topological s
 uperconductors with gate-controlled Majorana zero modes. We demonstrat
 e gateable Josephson junctions and a highly transparent 2D S-Sm interf
 ace based on the product of excess current and normal state resistance
 .<br>
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URL:https://www.physics.wisc.edu/events/?id=4474
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