Centro de Física, Instituto Venezolano de Investigaciones Científicas, Apartado 21874, Caracas 1020-A, Venezuela.
J Phys Condens Matter. 2010 Mar 24;22(11):115303. doi: 10.1088/0953-8984/22/11/115303. Epub 2010 Feb 23.
A spin filtering device based on quantum spin interference is addressed, for use with a two-dimensional GaAs/AlGaAs electron gas that has both Rashba and Dresselhaus spin-orbit (SO) couplings and an applied external magnetic field. We propose an experimentally feasible electronic Mach-Zehnder interferometer and derive a map, in parameter space, that determines perfect spin filtering conditions. We find two broad spin filtering regimes: one where filtering is achieved in the original incoming quantization basis, that takes advantage of the purely non-Abelian nature of the spin rotations; and another where one needs a tilted preferential axis in order to observe the polarized output spinor. Both solutions apply for arbitrary incoming electron polarization and energy, and are only limited in output amplitude by the randomness of the incoming spinor state. Including a full account of the beam splitter and mirror effects on spin yields solutions only for the tilted basis, but encompasses a broad range of filtering conditions.
我们提出了一种实验上可行的电子马赫-曾德尔干涉仪，并在参数空间中得出了一张图谱，该图谱确定了完美的自旋过滤条件。我们发现了两个广泛的自旋过滤区域：一个区域是在原始输入量子化基中实现的过滤，这利用了自旋旋转的纯非阿贝尔性质；另一个区域是需要一个倾斜的优先轴才能观察到极化的输出旋量。这两种解决方案都适用于任意输入电子的极化和能量，并且仅受到输入旋量状态随机性的限制。包括对自旋的分束器和反射镜效应的完整描述，仅给出了倾斜基的解，但涵盖了广泛的过滤条件。
