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首页> 外文期刊>Physical review >Spin filtering and scaling of spin-dependent potentials in quasi-one-dimensional electron liquids with Rashba spin-orbit interaction
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Spin filtering and scaling of spin-dependent potentials in quasi-one-dimensional electron liquids with Rashba spin-orbit interaction

机译：具有Rashba自旋轨道相互作用的准一维电子液体中自旋相关势的自旋滤波和缩放

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摘要

We investigate theoretically the spin-filtering effect in a quasi-one-dimensional (Q1D) electron liquid with spin-orbit interaction. The Q1D system considered is formed from a two-dimensional electron-gas (2DEG) subject to both a lateral confining potential and an interface potential perpendicular to the 2DEG. Spin and charge degrees of freedom in the system are mixed by the interface potential through the Rashba mechanism of spin-orbit interaction [A. V. Moroz and C. H. W. Barnes, Phys. Rev. B 60, 14272 (1999)] and we show that when a spin-dependent S potential is further introduced into the system, for example, via implantation of magnetic/ferromagnetic impurities, the mixing leads to the spin-filtering effect which favors electrons with a certain spin orientation to transport through the S potential. In particular, we calculate the scaling dimension of electron scattering both by spin-flip and by spin-independent S potentials when the temperature is varied and show that, in the spin-flip case, the scaling of electron scattering with temperature varies with spin orientation. Conductance is calculated for both spin and charge transport, and the spin-filtering effect is discussed quantitatively in terms of the conductance.
机译：我们从理论上研究具有自旋轨道相互作用的准一维（Q1D）电子液体中的自旋过滤效应。所考虑的Q1D系统是由二维电子气（2DEG）形成的，该电子气同时受到横向限制电位和垂直于2DEG的界面电位的作用。系统中的自旋和电荷自由度通过自旋轨道相互作用的Rashba机制与界面电位混合。 V.Moroz和C.H.W.Barnes，物理学Rev. B 60，14272（1999）]，并且我们表明，当自旋相关的S电位进一步引入系统时，例如，通过注入磁性/铁磁杂质，混合导致自旋过滤效应，有利于具有一定自旋取向的电子传输通过S势。特别是，当温度变化时，我们通过自旋翻转和独立于自旋的S势计算电子散射的尺度尺寸，并表明在自旋翻转的情况下，电子散射的尺度随温度的变化而自旋取向。计算自旋和电荷传输的电导率，并根据电导率定量讨论自旋过滤效果。

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