Quantum Andreev effect in 2D HgTe/CdTe quantum well-superconductor systems

Details Quantum Andreev effect in 2D HgTe/CdTe quantum well-superconductor systems Quantum Andreev effect in 2D HgTe/CdTe quantum well-superconductor systems

2010-12-14

arxiv.org/abs/1012.2959v1

Phys. Rev. B 83, 115315 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submit to Phys. Rev. Lett. on Jul. 16, 2010

Scientific paper

The Andreev reflection (AR) in 2D HgTe/CdTe quantum well-superconductor hybrid systems is studied. A quantized AR with AR coefficient equal to one is predicted, which is due to the multi-Andreev reflection near the interface of the hybrid system. Importantly, this quantized AR is not only universal, i.e., independent of any system parameters and quality of the coupling of the hybrid system, it is also robust against disorder as well. As a result of this quantum Andreev effect, the conductance exhibits a quantized plateau when the external bias is less the superconductor gap.

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