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Title: Andreev reflection at high magnetic fields: Evidence for electron and hole transport in edge states
Authors: Eroms, J ×
Weiss, D
Boeck, JD
Borghs, Gustaaf
Zulicke, U #
Issue Date: Sep-2005
Publisher: American physical soc
Series Title: Physical Review Letters vol:95 issue:10
Article number: 107001
Abstract: We have studied magnetotransport in arrays of niobium filled grooves in an InAs/AlxGa1-xSb heterostructure. The critical field of up to 2.6 T permits one to enter the quantum Hall regime. In the superconducting state, we observe strong magnetoresistance oscillations, whose amplitude exceeds the Shubnikov-de Haas oscillations by a factor of about 2, when normalized to the background. Additionally, we find that above a geometry-dependent magnetic field value the sample in the superconducting state has a higher longitudinal resistance than in the normal state. Both observations can be explained with edge channels populated with electrons and Andreev-reflected holes.
URI: 
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physics and Astronomy - miscellaneous
× corresponding author
# (joint) last author

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