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arXiv 0909.2443cond-mat.mes-hall
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自旋-轨道耦合混沌量子点中自旋输运的涨落

Fluctuations of spin transport through chaotic quantum dots with spin-orbit coupling

Jacob J. Krich

摘要:

随着使用自旋-轨道相互作用来控制自旋电流的设备被提出和实现,重要的是理解自旋-轨道耦合可以对通过量子点的传输施加的波动。利用随机矩阵理论,我们估计了自旋电流注入具有强自旋轨道耦合的混沌量子点时,传输电荷和自旋电流的典型尺度。这些结果对Schliemann,Egues和Loss提出的自旋晶体管的功能有影响。我们使用一个密度矩阵形式主义适当处理任意输入电流,并指出其连接到广泛使用的自旋电导图片。我们进一步考虑的情况下,纠缠在两个引线之间的电流,发现更大的波动。

英文摘要:

As devices to control spin currents using the spin-orbit interaction are proposed and implemented, it is important to understand the fluctuations that spin-orbit coupling can impose on transmission through a quantum dot. Using random matrix theory, we estimate the typical scale of transmitted charge and spin currents when a spin current is injected into a chaotic quantum dot with strong spin-orbit coupling. These results have implications for the functioning of the spin transistor proposed by Schliemann, Egues, and Loss. We use a density matrix formalism appropriate for treating arbitrary input currents and indicate its connections to the widely used spin-conductance picture. We further consider the case of currents entangled between two leads, finding larger fluctuations.

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