Tunneling conductance of a two-dimensional electron gas with Rashba spin-orbit coupling

We theoretically studied the in-plane tunneling spectroscopy of the hybrid structure composed of a metal and a two-dimensional electron gas with Rashba spin-orbit coupling. We found that the energy spacing between two distinct features in the conductance spectrum can be used to directly measure the Rashba energy. We also considered the effect that varying the probability of spin-conserving and spin-flip scattering at the interface has on the overall conductance. Surprisingly, an increase in interface scattering probability can actually result in increased conductance under certain conditions. Particularly, in the tunneling regime, an increase in spin-flip scattering probability enhances the conductance. It is also found that the interfacial scattering greatly affects the spin polarization of the conductance in metal, but hardly affects that in the Rashba system.