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VOLUME 105 (2017) | ISSUE 8 | PAGE 497
Interlayer current near the edge of an InAs/GaSb double quantum well in proximity with a superconductor
DOI: 10.7868/S0370274X17080070
Abstract
We investigate charge transport through the junction between a niobium superconductor and the edge of a two-dimensional electron-hole bilayer, realized in an InAs/GaSb double quantum well. For the transparent interface with a superconductor, we demonstrate that the junction resistance is determined by the interlayer charge transfer near the interface. From an analysis of experimental I-V curves we conclude that the proximity induced superconductivity efficiently couples electron and hole layers at low currents. The critical current demonstrates periodic dependence on the in-plane magnetic field, while it is monotonous for the field which is normal to the bilayer plane.