Charge transport in two dimensional electron gas/superconductor junctions with Rashba spin-orbit coupling

摘要

We have studied the tunneling conductance in two dimensional electron gas /insulator / superconductor junctions in the presence of Rashba spin-orbitcoupling (RSOC). It is found that for low insulating barrier the tunnelingconductance is suppressed by the RSOC while for high insulating barrier it isalmost independent of the RSOC. We also find the reentrant behavior of theconductance at zero voltage as a function of RSOC for intermediate insulatingbarrier strength. The results are essentially different from those predicted inferromagnet / superconductor junctions. The present derivation of theconductance is applicable to arbitrary velocity operator with off-diagonalcomponents.