TUNNELING CONDUCTANCE IN 2DEG/S JUNCTIONS IN THEPRESENCE OF RASHBA SPIN-ORBIT COUPLING

摘要

We have studied the tunneling conductance in two dimensional electron gas (2DEG)/ insulator / superconductor junctions in the presence of Rashba spin-orbit couplingin 2DEG. It is clarified how the tunneling conductance is influenced by the Rashbaspin-orbit coupling and found that for low insulating barrier the tunneling conductanceis suppressed by the Rashba spin-orbit coupling while for high insulating barrier thetunneling conductance is slightly enhanced by the Rashba spin-orbit coupling in contrastto ferromagnet / superconductor junctions. The results give a possibility to control theAndreev reflection probability by a gate voltage.