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arXiv 0811.2056cond-mat.str-el
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带双金属引线的相互作用量子线中的自旋极化电流

Spin-polarized currents through interacting quantum wires with nonmagnetic leads

J. E. Birkholz, V. Meden

摘要:

我们研究了基于Rashba自旋轨道相互作用的量子线自旋滤波器在电子-电子相互作用下的性能。有限长度的导线连接到两个半无限长的导线上。分析自旋极化的线性电导在零温度下,我们表明,自旋过滤是可能的,通过适当的调整系统参数首先考虑非相互作用的电子。其次,利用泛函重整化群方法研究了库仑相互作用引起的关联效应。对于短线,我们发现自旋极化的能量制度是强烈的库仑相互作用的影响。对于长导线,我们发现的幂律抑制的总电导低能量尺度典型的非均匀的Luttinger液体,而自旋极化的程度保持不变。

英文摘要:

We study the performance of a quantum wire spin filter that is based on the Rashba spin-orbit interaction in the presence of the electron-electron interaction. The finite length wire is attached to two semi-infinite nonmagnetic leads. Analyzing the spin polarization of the linear conductance at zero temperature, we show that spin-filtering is possible by adequate tuning of the system parameters first considering noninteracting electrons. Next, the functional renormalization group method is used to capture correlation effects induced by the Coulomb interaction. For short wires we show that the energy regime in which spin polarization is found is strongly affected by the Coulomb interaction. For long wires we find the power-law suppression of the total conductance on low energy scales typical for inhomogeneous Luttinger liquids while the degree of spin polarization stays constant.

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