Theory of charge transport in two-dimensional electron gas/noncentrosymmetric superconductor junction

Based on the extended Blonder-Tinkham-Klapwijk (BTK) approach, we have investigated the charge transport in two-dimensional electron gas/noncentrosymmetric superconductor (2DEG/NCS) junction. The effects of the Rashba spin-orbit coupling (RSOC) and the interface barrier on the conductance are taken into account. It is found that there is a peak of the conductance with the Rashba strength β in 2DEG for the nonzero Rashba strength χ in NCS. The peak feature of the conductance can be tuned largely by the interface barrier. These phenomena are essentially different from those found in FM/NCS tunneling junctions where the zero bias conductance is suppressed by χ, independent of the barrier strength.