Monday, May 27, 2013

1305.5685 (A. Kononov et al.)

Andreev reflection at the edge of a two-dimensional electron system with
strong spin-orbit coupling

A. Kononov, G. Biasiol, L. Sorba, E. V. Deviatov
We experimentally investigate transport properties of a single planar junction between the niobium superconductor and the edge of a two-dimensional electron system in a narrow $In_{0.75}Ga_{0.25}As$ quantum well with strong Rashba-type spin-orbit coupling. We experimentally demonstrate suppression of Andreev reflection at low biases at ultra low temperatures. From the analysis of temperature and magnetic field behavior, we interpret the observed suppression as a result of a spin-orbit coupling. There is also an experimental sign of the topological superconductivity realization in the present structure.
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