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

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

2004-04-14

arxiv.org/abs/cond-mat/0404323v2

Phys. Rev. Lett. 95, 107001 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

accepted for Phys Rev Lett, some changes to text

Scientific paper

10.1103/PhysRevLett.95.107001

We have studied magnetotransport in arrays of niobium filled grooves in an InAs/AlGaSb heterostructure. The critical field of up to 2.6 T permits 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 two, 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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