在共平面磁場中與Rashba 及Dresselhaus 自旋軌道交互作用之窄通道的量子傳輸

Abstract

We investigate coherent electronic quantum transport in a narrow channel with Rashba and Dresselhaus spin-orbit interaction in the presence of an external in-plane magnetic field that is applied along the channel direction. The spin-split energy spectrum is horizontally shifted respectively by the Rashba and the Dresselhaus effects and is vertically shifted by the applied magnetic field. First, we consider the Rashba spin-orbit interaction and the in-plane magnetic field in the narrow channel, there is a pseudo-gap in the energy spectrum. With the increasing magnetic field, we investigate the variation of the spin orientation. Furthermore, we find the hole-like quasi bound state and electron-like quasi-bound state features in conductance. When we consider the Rashba, Dresselhaus and Zeeman effects simultaneously, energy spectrum becomes asymmetry. In some specific cases, except for the quasi-bound state feature, we find the Fano effect in transport properties. Hence, in the presence of the Rashba spin-orbit interaction and the in-plane magnetic field, the Dresselhaus effect significantly affects coherent magneto-quantum transport properties.