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arXiv 0911.3577cond-mat.mes-hall
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强电子自旋-相干光学势的霍尔效应

Strong electron spin-Hall effect by a coherent optical potential

E. Ya. Sherman, J. G. Muga, V. K. Dugaev, A. Ruschhaupt

摘要:

我们从理论上证明了在低维半导体结构中利用红外辐射对自旋轨道耦合的电子自旋进行相干操纵是可能的。所提出的方法是基于使用一个偶极力作用在一个非均匀的光场中的二能级系统,类似于在冷原子二极管的设计。对于弹道电子,与外部辐射强度成比例的自旋相关力导致自旋-霍尔效应和由此产生的自旋分离,即使自旋-轨道耦合本身不允许这些效应。具有相反自旋的电子的可实现的空间分离可以是十分之几微米的量级,比扩散区中带电杂质散射产生的量级大一个数量级。

英文摘要:

We demonstrate theoretically that a coherent manipulation of electron spins in low-dimensional semiconductor structures with spin-orbit coupling by infrared radiation is possible. The proposed approach is based on using a dipole force acting on a two-level system in a nonuniform optical field, similar to that employed in the design of the cold atoms diode. For ballistic electrons the spin-dependent force, proportional to the intensity of external radiation, leads to a spin-Hall effect and resulting spin separation even if the spin-orbit coupling itself does not allow for these effects. Achievable spatial separation of electrons with opposite spins can be of the order of several tenth of a micron, an order of magnitude larger than can be produced by the charged impurity scattering in the diffusive regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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