Andreev reflection at high magnetic fields : Evidence for electron and hole transport in edge states

We have studied magnetotransport in arrays of niobium filled grooves in an InAs/Al(x)Ga(1-x)Sb 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...

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Published in:Physical review letters 2005-09, Vol.95 (10), p.107001.1-107001.4, Article 107001
Main Authors: EROMS, J, WEISS, D, DE BOECK, J, BORGHS, G, ZÜLICKE, U
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Superconductivity
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cited_by cdi_FETCH-LOGICAL-c450t-58a0dd958606a1d0e0671a802d991befdb884af25bea2002603f1b62ed133fd93
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container_title Physical review letters
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description We have studied magnetotransport in arrays of niobium filled grooves in an InAs/Al(x)Ga(1-x)Sb 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.
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subjects Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Superconductivity
title Andreev reflection at high magnetic fields : Evidence for electron and hole transport in edge states
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