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arXiv 1012.1831cond-mat.mes-hall
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介观自旋电流的自旋-电荷转换

Spin-to-Charge Conversion of Mesoscopic Spin Currents

Peter Stano, Philippe Jacquod

摘要:

最近的理论研究表明,自旋电流可以通过使电流通过自旋轨道耦合介观系统而产生。然而,测量这些自旋电流迄今尚未实现。我们展示了如何在横向异质结介观自旋电流可以用单通道电压探针测量。在存在自旋电流的情况下,通过连接探针的量子点接触的电荷电流$I_{\rm qpc}$在外部施加的塞曼场$B$中为奇数,而在不存在自旋电流的情况下为偶数。此外,零场导数$\partial_B I_{\rm qpc}$与自旋电流的大小成比例,比例系数可以在独立测量中确定。我们在数字上证实了这些发现。

英文摘要:

Recent theoretical investigations have shown that spin currents can be generated by passing electric currents through spin-orbit coupled mesoscopic systems. Measuring these spin currents has however not been achieved to date. We show how mesoscopic spin currents in lateral heterostructures can be measured with a single-channel voltage probe. In the presence of a spin current, the charge current $I_{\rm qpc}$ through the quantum point contact connecting the probe is odd in an externally applied Zeeman field $B$, while it is even in the absence of spin current. Furthermore, the zero field derivative $\partial_B I_{\rm qpc}$ is proportional to the magnitude of the spin current, with a proportionality coefficient that can be determined in an independent measurement. We confirm these findings numerically.

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