Eroms, Jonathan and Weiss, Dieter and DeBoeck, J. and Borghs, G. and Zülicke, U. (2005) Andreev reflection at high magnetic fields: Evidence for electron and hole transport in edge states. Physical Review Letters 95, p. 107001.
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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 Shubnikovde 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.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||25 May 2009 13:21|
|Last Modified:||05 Aug 2009 13:57|