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Spin rotation, spin filtering, and spin transfer in directional tunneling through barriers in noncentrosymmetric semiconductors

机译:通过非中心对称半导体中的势垒的定向隧穿中的自旋旋转,自旋滤波和自旋转移

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摘要

We discuss possible tunneling phenomena associated with complex wave vectors along directions where the spin degeneracy is lifted in noncentrosymetric semiconductors. We show that the result drastically depends on the direction. In the [110] direction, no solution can be calculated in the usual way assuming that the wave function and its derivative are continuous. A method for obtaining physical solutions is given and consequences are drawn. As a result, there is no spin filtering in such a direction but the spin undergoes a precession through the barrier with the rotation angle being proportional to the barrier thickness. In a direction close to [001] we find a spin-filter effect in close agreement with the model discussed by Perel' et al. [Phys. Rev. B 67, 201304(R) (2003)].
机译:我们讨论了在非定心半导体中沿着自旋简并性提升的方向与复杂波矢量相关的可能的隧穿现象。我们表明结果完全取决于方向。在[110]方向上,假设波动函数及其导数是连续的,则无法以通常的方式计算解。给出了一种获得物理解的方法并得出了结论。结果,在这样的方向上没有自旋滤波,但是自旋通过屏障进入旋进,旋转角度与屏障厚度成比例。在接近[001]的方向上,我们发现自旋滤镜效应与Perel等人讨论的模型非常吻合。 [物理修订版B 67,201304(R)(2003)]。

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