Volume 91, Number 1, July 2010
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 July 2010|
Andreev transport in two-dimensional normal-superconducting systems in strong magnetic fields
Institute for Physics of Microstructures, Russian Academy of Sciences - 603950 Nizhny Novgorod, GSP-105, Russia
2 L. D. Landau Institute for Theoretical Physics RAS - 117940 Moscow, Russia
3 Argonne National Laboratory - Argonne, IL 60439, USA
4 Institute for High Pressure Physics, Russian Academy of Sciences - Troitsk 142190, Moscow Region, Russia
Accepted: 28 June 2010
The conductance in two-dimensional (2D) normal-superconducting (NS) systems is analyzed in the limit of strong magnetic fields when the transport is mediated by the electron-hole states bound to the sample edges and NS interface, i.e., in the Integer Quantum Hall Effect regime. The Andreev-type process of the conversion of the quasiparticle current into the superflow is shown to be strongly affected by the mixing of the edge states localized at the NS and insulating boundaries. The magnetoconductance in 2D NS structures is calculated for both quadratic and Dirac-like normal state spectra. Assuming a random scattering of the edge modes we analyze both the average value and fluctuations of conductance for an arbitrary number of conducting channels.
PACS: 72.10.-d – Theory of electronic transport; scattering mechanisms / 73.23.-b – Electronic transport in mesoscopic systems / 73.63.-b – Electronic transport in nanoscale materials and structures
© EPLA, 2010
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