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Proximity induced superconductivity in indium gallium arsenide quantum wells

Delfanazari, K; Puddy, RK; Ma, P; Yi, T; Cao, M; Gul, Y; Farrer, I; ... Smith, CG; + view all (2017) Proximity induced superconductivity in indium gallium arsenide quantum wells. Journal of Magnetism and Magnetic Materials 10.1016/j.jmmm.2017.10.057. (In press). Green open access

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Abstract

We report on the experimental observation of the proximity induced superconductivity in an indium gallium arsenide (In 0.75 Ga 0.25 As) quantum well. The Josephson junction was fabricated by several photo-lithographic processes on an InGaAs heterojunction and Niobium (Nb) was used as superconducting electrodes. Owing to the Andreev reflections and Andreev bound states at the Nb-In 0.75 Ga 0.25 As quantum well-Nb interfaces, the subharmonic energy gap structures (SGS) are observed at the differential conductance (dI/dV) versus voltage (V) plots when the applied source-drain bias voltages satisfy the expression V SD [U+202F]=[U+202F] 2δ/ne. The dI/dV as a function of applied magnetic field B shows a maximum at zero B which decreases by increasing B. When decreasing B to below ±0.4[U+202F]T, a hysteresis and shift of the conductance maxima close to B[U+202F] =[U+202F]0 T are observed. Our results help to pave the way to the development of integrated coherent quantum circuitry.

Type: Article
Title: Proximity induced superconductivity in indium gallium arsenide quantum wells
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jmmm.2017.10.057
Publisher version: http://doi.org/10.1016/j.jmmm.2017.10.057
Language: English
Additional information: © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10039770
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