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arXiv 2204.03263cond-mat.mes-hall
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时间反演对称体系中手性依赖的二阶自旋流

Chirality-dependent second-order spin current in systems with time-reversal symmetry

Ryosuke Hirakida, Junji Fujimoto, Masao Ogata

AI总结:

本文在具有时间反演对称性的紧束缚模型中,利用玻尔兹曼方程证明一阶自旋流消失而二阶自旋流可有限存在,且其符号随体系手性反转,揭示了手性依赖的自旋流机制。

摘要:

在具有时间反演对称性的特定紧束缚模型中,计算了正比于电场一阶和二阶的自旋流。具体而言,构建了一个具有时间反演对称性、并包含手性跃迁和自旋轨道耦合的紧束缚模型。利用玻尔兹曼方程计算了该模型的自旋电导率。结果表明,电场的一阶自旋流消失,而二阶自旋流可以不为零。此外,通过反转模型的手性,自旋流会改变符号。本结果揭示了在具有时间反演对称性的体系中存在依赖于体系手性的自旋流。这些结果可能为理解时间反演对称体系中手性依赖的自旋极化现象提供有用的信息。

英文摘要:

Spin currents proportional to the first- and second-order of the electric field are calculated in a specific tight-binding model with time-reversal symmetry. Specifically, a tight-binding model with time-reversal symmetry is constructed with chiral hopping and spin-orbit coupling. The spin conductivity of the model is calculated using the Boltzmann equation. As a result, it is clarified that the first-order spin current of the electric field vanishes, while the second-order spin current can be finite. Furthermore, the spin current changes its sign by reversing the chirality of the model. The present results reveal the existence of spin currents in systems with time-reversal symmetry depending on the chirality of the system. They may provide useful information for understanding the chirality-dependent spin polarization phenomena in systems with time-reversal symmetry.

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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