Andreev reflection and cyclotron motion at superconductor -- normal-metal interfaces
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0504514,
title = {Andreev reflection and cyclotron motion at superconductor -- normal-metal interfaces},
author = {F. Giazotto and M. Governale and U. Zuelicke and F. Beltram},
journal= {arXiv preprint arXiv:cond-mat/0504514},
year = {2007}
}
Comments
8 pages, 6 figures