Generation of spin-polarized currents in Zeeman-split Tomonaga-Luttinger models.
Generation of spin-polarized currents in Zeeman-split Tomonaga-Luttinger models.
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在塞曼分裂 Tomonaga-Luttinger 模型中产生自旋极化电流。
DOI：
10.1103/physrevb.53.9572
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Aoki
中科院分区：
文献类型：
--
作者：
Kimura;Kuroki;Aoki
在磁场中，一维相互作用的电子气可以被描述为 Tomonaga-Luttinger 模型，该模型包括由于塞曼分裂而具有不同费米速度的两个分量。这破坏了自旋电荷分离，甚至密度-密度相关性等量都涉及自旋和电荷临界指数（K）。具体来说，脏系统中的上自旋和下自旋电导率的比率在低温下会发散，就像温度的倒数 $T^{-(K_{\uparrow}-K_{\downarrow})}$ 一样，从而产生自旋极化电流。在有限的、干净的系统中，上自旋和下自旋的电导变得不同，这是电子-电子相互作用的另一种表现形式。
In a magnetic field an interacting electron gas in one dimension may be described as a Tomonaga-Luttinger model comprising two components with different Fermi velocities due to the Zeeman splitting. This destroys the spin-charge separation, and even the quantities such as the density-density correlation involve spin and charge critical exponents (K). Specifically, the ratio of the up-spin and down-spin conductivities in a dirty system diverges at low temperatures like an inverse power of the temperature, $T^{-(K_{\uparrow}-K_{\downarrow})}$, resulting in a spin-polarized current. In finite, clean systems the conductance becomes different for up- and down-spins as another manifestation of the electron-electron interaction.