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Giant supercurrent states in a superconductor-InAs/GaSb-superconductor junction

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4932644· OSTI ID:22492771
; ; ;  [1]; ;  [2];  [3]
  1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
  2. School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)
  3. Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States)
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Superconductivity in topological materials has attracted a great deal of interest in both electron physics and material sciences since the theoretical predictions that Majorana fermions can be realized in topological superconductors. Topological superconductivity could be realized in a type II, band-inverted, InAs/GaSb quantum well if it is in proximity to a conventional superconductor. Here, we report observations of the proximity effect induced giant supercurrent states in an InAs/GaSb bilayer system that is sandwiched between two superconducting tantalum electrodes to form a superconductor-InAs/GaSb-superconductor junction. Electron transport results show that the supercurrent states can be preserved in a surprisingly large temperature-magnetic field (T – H) parameter space. In addition, the evolution of differential resistance in T and H reveals an interesting superconducting gap structure.

OSTI ID:
22492771
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 13 Vol. 118; ISSN JAPIAU; ISSN 0021-8979
Country of Publication:
United States
Language:
English

References (4)

Unconventional Josephson Effect in Hybrid Superconductor-Topological Insulator Devices journal July 2012
Critical-temperature enhancement in thin superconducting films due to field dependence of the coherence length journal February 1987
Superconducting Proximity Effect in the Native Inversion Layer on InAs journal June 1985
Edge-mode superconductivity in a two-dimensional topological insulator journal May 2015

Cited By (7)

Topological Majorana Two-Channel Kondo Effect journal October 2017
Detection of Majorana Kramers Pairs Using a Quantum Point Contact journal July 2016
Topological Majorana Two-Channel Kondo Effect text January 2016
Probing the semiconductor to semimetal transition in InAs/GaSb double quantum wells by magneto-infrared spectroscopy journal January 2017
Single-edge transport in an InAs/GaSb quantum spin Hall insulator journal July 2016
Fabrication and Characterization of Superconducting Films for Superconductor-Topological Insulator Hybrid Devices journal September 2019
π and 4 π Josephson Effects Mediated by a Dirac Semimetal journal April 2018

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRONS
GALLIUM ANTIMONIDES
INDIUM ARSENIDES
MAGNETIC FIELDS
MATERIALS
PROXIMITY EFFECT
QUANTUM WELLS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS