论文标题
二维半导体莫伊尔模式的电子晶体的声子
Phonons of electronic crystals in two-dimensional semiconductor moiré patterns
论文作者
论文摘要
我们从理论上研究了最近在二维半导体Moiré模式中发现的三角形，条纹和蜂窝型电子晶体的声子特性。通过分析声子分散剂，我们发现相互作用引起的曲折条纹晶体中的晶格变形可导致比线性条纹晶体更高的动力稳定性。此外，在时间反向或反转对称性破裂下，具有有限磁化和大浆果曲率的手性声子可以在三角形和蜂窝晶体中出现。电子的小有效质量可以从区域中心声子的光学活动与非harm谐性结合的选择性和有效地产生手性声子，从而促进了声子霍尔效应的实现。这些发现指出了一个令人兴奋的新平台，用于探索手性声子和相关的拓扑语音设备。
We theoretically studied the phonon properties of the triangular-, stripe- and honeycomb-type electronic crystals recently found in two-dimensional semiconductor moiré patterns. By analyzing the phonon dispersions, we found the interaction induced lattice deformation in the zigzag-stripe crystal results in a much higher dynamical stability than in the linear-stripe crystal. Moreover, chiral phonons with finite magnetizations and large Berry curvatures can emerge in triangular and honeycomb crystals under time-reversal or inversion symmetry breaking. The small effective mass of the electrons allows the selective and efficient generation of chiral phonons from the optical activity of zone-center phonons combined with the anharmonicity, facilitating the realization of the phonon Hall effect. These findings point to an exciting new platform for exploring chiral phonons and the related topological phononic devices.
