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
Institute of Solid State Physics of the RAS, 142432 Chernogolovka, Russia
Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
+IOM CNR, Laboratorio TASC, 34149 Trieste, Italy
*NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, 56127 Pisa, Italy
Abstract
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
In0.75Ga0.25As 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.