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Title: Giant Andreev backscattering through a quantum point contact coupled via a disordered two-dimensional electron gas to superconductors
Authors: denHartog, SG
vanWees, BJ
Nazarov, YV
Klapwijk, TM
Borghs, Gustaaf #
Issue Date: Oct-1997
Publisher: American physical soc
Series Title: Physical Review Letters vol:79 issue:17 pages:3250-3253
Abstract: We have investigated the superconducting-phase-modulated reduction in the resistance of a ballistic quantum point contact (QPC) connected via a disordered two-dimensional electron gas (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. In contrast, the magnitude of the phase-dependent resistance of the disordered 2DEG displays a nonmonotonic reentrant behavior versus bias voltage.
URI: 
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physics and Astronomy - miscellaneous
# (joint) last author

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