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arXiv 1201.0249cond-mat.mes-hall
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介观结构中的非线性自旋-电荷转换

Non-linear spin to charge conversion in mesoscopic structures

Peter Stano, Jaroslav Fabian, Philippe Jacquod

摘要:

受最近实验的启发[Vera-Marun等人,arXiv:1109.5969],我们建立了量子相干导体中自旋输运的非线性理论。我们展示了如何一个介观收缩与能量依赖的传输可以转换成电信号的自旋积累注入的自旋电流,既不依赖于磁场,也不交换领域。当通过收缩的传输是自旋无关的,自旋-电荷耦合是非线性的,具有在累积中是二次的电信号。我们估计,门控介观收缩的灵敏度,允许检测积累远小于百分之一的费米能量。

英文摘要:

Motivated by recent experiments [Vera-Marun et al., arXiv:1109.5969], we formulate a non-linear theory of spin transport in quantum coherent conductors. We show how a mesoscopic constriction with energy-dependent transmission can convert a spin current injected by a spin accumulation into an electric signal, relying neither on magnetic nor exchange fields. When the transmission through the constriction is spin-independent, the spin-charge coupling is non-linear, with an electric signal that is quadratic in the accumulation. We estimate that gated mesoscopic constrictions have a sensitivity that allows to detect accumulations much smaller than a percent of the Fermi energy.

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