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arXiv 1111.3624cond-mat.mes-hall
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用于GaAs/AlGaAs电子气自旋过滤的马赫-曾德尔干涉仪

Mach-Zehnder Interferometric device for spin filtering in a GaAs/AlGaAs electron gas

Benjamin Santos, Ernesto Medina, Alexander López, Bertrand Berche

摘要:

在同时具有Rashba和Dresselhaus自旋轨道耦合的GaAs/AlGaAs电子气中,提出了一种利用量子自旋干涉的自旋滤波器件。该装置通过分离自旋向上和自旋向下分量而没有磁场梯度来实现极化电子流。我们发现两个广泛的自旋过滤制度,其中一个干涉仪具有对称的武器,需要一个小的磁通量来实现自旋分离,和其他的非对称武器的路径长度的变化呈现一个额外的相位模拟的磁场的影响。我们确定的设备,其中最佳的电子极化的值范围内发现在2D电子气实现的操作点。这两种设备设置适用于任意入射电子极化,并在入射电子带内的宽能量范围内工作。

英文摘要:

A spin filtering device using quantum spin interference is theoretically proposed in a GaAs/AlGaAs electron gas that has both Rashba and Dresselhaus spin-orbit couplings. The device achieves polarized electron currents by separating spin up and spin down components without a magnetic field gradient. We find two broad spin filtering regimes, one where the interferometer has symmetrical arms, where a small magnetic flux is needed to achieve spin separation, and the other with asymmetric arms where the change in path length renders an extra phase emulating the effects of a magnetic field. We identify operating points for the device where optimal electron polarization is achieved within value ranges found in a 2D electron gas. Both device setups apply for arbitrary incoming electron polarization and operate at broad energy ranges within the incoming electron band.

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