Charge conductance and spin-polarized current across a metal/cubic semiconductor with Dresselhaus spin-orbit coupling junction

We theoretically study the charge conductance across a metal/cubic semiconductor with Dresselhaus spin-orbit coupling junction. The conductance at a zero-applied voltage is calculated by using a free electron and scattering methods. The carrier density of semiconductor and the strength of Dresselhaus system are investigated on the overall conductance. We found that the conductance appears a kink feature which occurs when the Fermi level reaches the coincidence of Dresselhaus spin-orbit coupling band interaction. The Dresselhaus coupling strength increases, the conductance decreases until the strength reaches a critical value. Beyond this value, the conductance gradually increases with the coupling strength. The conductance can be enhanced when both types of interface spin scattering (spin-flip and non-spin-flip) are risen under certain condition. The spin polarization of current in the Dresselhaus system at a zero-applied voltage is also studied. We found that its magnitude is large by increasing the carrier density and it weakly depend on the interfacial scattering. However, at the low carrier density, the sign of spin polarization switches when both types of interface spin scattering are taken into account.