论文标题
声子旋转效应
Phonon rotoelectric effect
论文作者
论文摘要
在具有时间反向对称性但没有反转对称性的晶体中，可以通过温度梯度产生声子角动量，并且称为Phonon Thermal Edelstein效应。另一方面，当两个对称性被打破并且其产物是保守的时，任何波矢量的任何声子模式的声子动量消失，并且声子热埃德尔斯坦效应不会发生。在本文中，我们提出了一种产生声子角动量的机制。我们表明，在这样的晶体中，电场通过电场引起的晶格失真会产生声子角动量。这种效果在具有磁电效应的同一对称类别中，我们称之为效应的声子旋转效应。我们讨论由温度梯度以及高温和低温极限中的电场产生的声子角动量的温度依赖性。
In crystals with time-reversal symmetry but without inversion symmetry, the phonon angular momentum can be generated by the temperature gradient, and it is called phonon thermal Edelstein effect. On the other hand, when both symmetries are broken and their product is conserved, the phonon angular momentum for any phonon modes at any wave vectors vanishes, and the phonon thermal Edelstein effect does not occur. In this paper, we propose another mechanism of generation of the phonon angular momentum. We show that in such crystals the electric field generates the phonon angular momentum, via the lattice distortion due to the electric field. This effect is in the same symmetry class with the magnetoelectric effect, and we call this effect phonon rotoelectric effect. We discuss the temperature dependence of the phonon angular momentum generated by the temperature gradient and by the electric field in the high- and the low-temperature limits.
