论文标题
电流引起的声子大厅效应
Current-induced phonon Hall effect
论文作者
论文摘要
自2005年对声子效应（PHE）的第一个实验性观察以来，已经对其物理起源和理论解释进行了广泛的研究。虽然据信自旋 - 轨道相互作用在外部磁场下起重要作用，但也可以进行非磁性效应。在这里，我们提出了一种PHE机制，该机制是通过电子 - phonon相互作用在非平衡系统中的电流引起的。漂移电子对声子自由度的影响，作为对出生的近代近似的校正，由反对称矩阵表示，该矩阵的形式与典型的声子大厅模型相同。我们使用一个像石墨烯一样的六角形晶格演示了这个想法，该晶格在驱动的电流下具有有限的声子电导率。
Since the first experimental observation of the phonon Hall effect (PHE) in 2005, its physical origin and theoretical explanation have been extensively investigated. While spin-orbit interactions are believed to play important roles under external magnetic fields, nonmagnetic effects are also possible. Here, we propose a mechanism of PHE which is induced by electric current in a nonequilibrium system through electron-phonon interactions. The influence of the drift electrons to the phonon degrees of freedom, as a correction to the Born-Oppenheimer approximation, is represented by an antisymmetric matrix which has the same form as in a typical phonon Hall model. We demonstrate the idea with a graphene-like hexagonal lattice having a finite phonon Hall conductivity under a driven electric current.
