Title: Reentrant resistance and giant Andreev backscattering in a two-dimensional electron gas coupled to superconductors
Authors: den Hartog, SG
van Wees, BJ
Nazarov, YV
Klapwijk, TM
Borghs, Gustaaf #
Issue Date: Jun-1998
Publisher: Elsevier science bv
Series Title: Physica B vol:251 pages:467-471
Abstract: We first present the bias-voltage dependence of the superconducting phase-dependent reduction in the differential resistance of a disordered T-shaped two-dimensional electron gas (2DEG) coupled to two superconductors. This reduction exhibits a reentrant behavior, since it first increases upon lowering the bias voltage, exhibits a maximum for a bias voltage of about the Thouless energy and disappears almost completely at zero bias voltage. Second, we have investigated the superconducting-phase-modulated reduction in the resistance of a ballistic quantum point contact (QPC) connected via a disordered 2DEG to superconductors. We show that this reduction is caused by coherent Andreev backscattering of holes through the QPC, which increases monotonically by reducing the bias voltage to zero. (C) 1998 Elsevier Science B.V. All rights reserved.
ISSN: 0921-4526
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physics and Astronomy - miscellaneous
# (joint) last author

Files in This Item:

There are no files associated with this item.

Request a copy


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science