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Specular Andreev reflection at the edge of an InAs/GaSb double quantum well with band inversion
A. Kononov ; S.V. Egorov ; V.A. Kostarev ; B.R. Semyagin ; V.V. Preobrazhenskii ; M.A. Putyato ; E.A. Emelyanov ; E.V. Deviatov ;
Date:	27 May 2016
Abstract:	We experimentally investigate transport through the side junction between a niobium superconductor and the mesa edge of a two-dimensional system, realized in an InAs/GaSb double quantum well with band inversion. We demonstrate, that different transport regimes can be achieved by variation of the mesa step. We observe anomalous behavior of Andreev reflection within a finite low-bias interval, which is invariant for both transport regimes. We connect this behavior with the transition from retro- (at low biases) to specular (at high ones) Andreev reflection channels in an InAs/GaSb double quantum well with band inversion.
Source:	arXiv, 1605.8539
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