Li Meiqi, Li Zhibing, Chen Huanjun, Wang Weiliang
School of Physics, Sun Yat-sen University, Guangzhou 510275, China.
School of Science, Shenzhen Campus, Sun Yat-sen University, Shenzhen 518107, China.
Nanomaterials (Basel). 2024 Mar 29;14(7):607. doi: 10.3390/nano14070607.
In recent studies, it has been discovered that phonons can carry angular momentum, leading to a series of investigations into systems with three-fold rotation symmetry. However, for systems with two-fold screw rotational symmetry, such as α-MoO, there has been no relevant discussion. In this paper, we investigated the pseudoangular momentum of phonons in crystals with two-fold screw rotational symmetry. Taking α-MoO as an example, we explain the selection rules in circularly polarized Raman experiments resulting from pseudoangular momentum conservation, providing important guidance for experiments. This study of pseudoangular momentum in α-MoO opens up a new degree of freedom for its potential applications, expanding into new application domains.
在最近的研究中，人们发现声子可以携带角动量，从而引发了对具有三重旋转对称性的系统的一系列研究。然而，对于具有二重螺旋旋转对称性的系统，如α-MoO，尚未有相关讨论。在本文中，我们研究了具有二重螺旋旋转对称性的晶体中声子的赝角动量。以α-MoO为例，我们解释了由赝角动量守恒导致的圆偏振拉曼实验中的选择规则，为实验提供了重要指导。对α-MoO中赝角动量的这项研究为其潜在应用开辟了一个新的自由度，拓展到了新的应用领域。
