2000 character limit reached
Specular Andreev reflection at the edge of an InAs/GaSb double quantum well with band inversion (1605.08539v1)
Published 27 May 2016 in cond-mat.mes-hall and cond-mat.supr-con
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.