Andreev reflection and cyclotron motion at superconductor—normal-metal interfaces
F. Giazotto, M. Governale, U. Zülicke, F. Beltram
DOI 10.1103/PhysRevB.72.054518 · Physical Review B
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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.
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