论文标题
由于温度梯度诱导的密度基质中的异常元素，异常的声子角动量
Abnormal Phonon Angular Momentum due to Off-diagonal Elements in Density Matrix induced by Temperature Gradient
论文作者
论文摘要
当应用温度梯度时，可以生成手性材料中声子动量（PAM）的非零平均值。我们发现，PAM的对角线和非对角线术语都通过使用kubo公式，在考虑到热电流操作员的对角线和非对角线元件的情况下，有助于平均PAM。计算结果表明，当声子散射足够强时，非对角项占主导地位。这一发现表明，温度梯度诱导的不同声子模式之间的量子过渡强烈影响局部原子旋转。我们的发现提供了最近观察到的手性声子激活自旋seebeck效果的解释。
Nonzero mean value of phonon angular momentum (PAM) in chiral materials can be generated when a temperature gradient is applied. We find that both diagonal and off-diagonal terms of PAM contribute to mean PAM by using the Kubo formula where both diagonal and off-diagonal elements of the heat current operator are considered. The calculation results show that the off-diagonal term is dominant when the phonon scattering is strong enough. This finding reveals that the quantum transition between different phonon modes induced by temperature gradient strongly affects the local atomic rotation. Our discovery provides an explanation of the recently observed chiral phonon activated spin Seebeck effect.
