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

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Eroms, Jonathan ; Weiss, Dieter ; DeBoeck, J. ; Borghs, G. ; Zülicke, U.
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Date of publication of this fulltext: 05 Aug 2009 13:57


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. ...


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