论文标题
依赖手性的二阶自旋电流在具有时间反转对称性的系统中
Chirality-dependent second-order spin current in systems with time-reversal symmetry
论文作者
论文摘要
与电场的一阶和二阶成比例的自旋电流是在特定的紧密结合模型中计算出的，具有时间反转对称性。具体而言，具有时间反转对称性的紧密结合模型是通过手性跳跃和旋转轨道耦合构建的。使用Boltzmann方程计算模型的自旋电导率。结果，可以澄清的是，电场的一阶自旋电流消失，而二阶自旋电流可以是有限的。此外，旋转电流通过逆转模型的手性来改变其标志。目前的结果揭示了系统中具有时间反转对称性的系统中的自旋电流，具体取决于系统的手性。他们可能会提供有用的信息，以了解具有时间反向对称性系统的系统中依赖性的自旋极化现象。
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.
