Topology and symmetry of circular photogalvanic effect in the chiral multifold semimetals: a review
Topology and symmetry of circular photogalvanic effect in the chiral multifold semimetals: a review
复制标题
手性多重半金属中圆形光电效应的拓扑和对称性：综述
DOI：
--
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Yan Sun
中科院分区：
文献类型：
--
作者：
C. Le;Yan Sun
圆形光电流效应（CPGE）是手征外尔和多重对称半金属中唯一可能的量子化信号。本文主要从CPGE张量的分类、CPGE的k-ε p有效模型量子化和拓扑半金属RhSi族三个方面对CPGE在手征多重半金属中的应用进行了综述。首先，我们对CPGE张量进行了完全对称分析，得到了一个反应张量分类矩阵表。其次，在非中心对称拓扑半金属中，CPGE成为量子化响应，并且依赖于多重费米子的陈数。基于具有线性色散的k-ε p有效模型，给出了CPGE量子化的详细推导。最后，根据基于非相互作用电子结构的量子化CPGE的从头算分析，我们对RhSi族中的手性拓扑半金属进行了新的计算。第一组包括RhSi、PtAl和CoSi，可以是展现量化的CPGE迹线的有希望的候选者，而第二组包括没有量化的PdGa、PtGa和RhSn。
The circular photogalvanic effect (CPGE) is the only possible quantized signal in chiral Weyl and multifold semimetals with inversion and mirror symmetries broken. Here, we review CPGE in the chiral multifold semimetals in terms of classification of CPGE tensor, the quantization of CPGE from k ⋅ p effective model and topological semimetal RhSi family. Firstly, we give complete symmetric analysis of CPGE tensors for all nonmagnetic point groups, and get a table classifying matrix of response tensors. Secondly, the CPGE becomes a quantized response in the noncentrosymmetric topological semimetals, and depends on the Chern number of multifold fermions. Based on k ⋅ p effective model with linear dispersion, detailed derivations about the quantization of CPGE are given. Finally, according to ab initio analysis for the quantized CPGE based on noninteracting electronic structures, we review previous reports and make new calculations for the chiral topological semimetals in RhSi family, which can be separated into two groups. The first group, including RhSi, PtAl and CoSi, can be the promising candidates to exhibit a quantized CPGE trace, while the second group includes PdGa, PtGa and RhSn without a quantization.