Andreev reflection and cyclotron motion at superconductor -- normal-metal interfaces

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We investigate Andreev reflection at the interface between a superconductor and a two--dimensional electron system (2DES) in an external magnetic field such that cyclotron motion is important in the latter. A finite Zeeman splitting in the 2DES and the presence of diamagnetic screening currents in the superconductor are incorporated into a microscopic theory of Andreev edge states, which is based on the Bogoliubov--de Gennes formalism. The Andreev--reflection contribution to the interface conductance is calculated. The effect of Zeeman splitting is most visible as a double--step feature in the conductance through clean interfaces. Due to a screening current, conductance steps are shifted to larger filling factors and the formation of Andreev edge states is suppressed below a critical filling factor.
8 pages, 6 figures

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Mesoscale and Nanoscale Physics, Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/96483

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0504514
 http://arxiv.org/abs/cond-mat/0504514
 Phys. Rev. B 72, 054518 (2005)
 doi:10.1103/PhysRevB.72.054518

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arXiv