Induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures

Zhong Wan, Aleksandr Kazakov, Michael J. Manfra, Loren N. Pfeiffer, Ken W. West and Leonid P. Rokhinson ()
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Zhong Wan: Purdue University
Aleksandr Kazakov: Purdue University
Michael J. Manfra: Purdue University
Loren N. Pfeiffer: Princeton University
Ken W. West: Princeton University
Leonid P. Rokhinson: Purdue University

Nature Communications, 2015, vol. 6, issue 1, 1-5

Abstract: Abstract Search for Majorana fermions renewed interest in semiconductor–superconductor interfaces, while a quest for higher-order non-Abelian excitations demands formation of superconducting contacts to materials with fractionalized excitations, such as a two-dimensional electron gas in a fractional quantum Hall regime. Here we report induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures and development of highly transparent semiconductor–superconductor ohmic contacts. Supercurrent with characteristic temperature dependence of a ballistic junction has been observed across 0.6 μm, a regime previously achieved only in point contacts but essential to the formation of well separated non-Abelian states. High critical fields (>16 T) in NbN contacts enables investigation of an interplay between superconductivity and strongly correlated states in a two-dimensional electron gas at high magnetic fields.

Date: 2015
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DOI: 10.1038/ncomms8426

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