论文标题
电子自旋和微观原子旋转之间的转换
Conversion between electron spin and microscopic atomic rotation
论文作者
论文摘要
从理论上讲，我们研究了电子自旋与晶体中原子的微观局部旋转之间转化的微观机制。在具有角动量的声子模式下，原子显微镜在晶体中的平衡位置旋转。在带有声子的简单玩具模型中，我们通过使用绝热系列扩展来计算自旋期望值。我们表明，时间平均的自旋磁化是通过自旋轨道相互作用的微观局部旋转产生的。另一方面，在原子的简单振动的系统中，由于时间转换对称性，时间平均的自旋磁化变为零。此外，时间平均的自旋磁化的大小取决于瞬时特征力差的差，并且我们表明它在具有较大间隙的带绝缘子中变小。
We theoretically investigate the microscopic mechanism of conversion between the electron spin and the microscopic local rotation of atoms in crystals. In phonon modes with angular momenta, the atoms microscopically rotate around their equilibrium positions in crystals. In a simple toy model with phonons, we calculate the spin expectation value by using the adiabatic series expansion. We show that the time-averaged spin magnetization is generated by the microscopic local rotation of atoms via the spin-orbit interaction. On the other hand, in the system with a simple vibration of atoms, time-averaged spin magnetization becomes zero due to the time-reversal symmetry. Moreover, the magnitude of the time-averaged spin magnetization depends on the inverse of the difference of instantaneous eigenenergy, and we show that it becomes smaller in band insulators with a larger gap.
