Le Congcong, Sun Yan
Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), Wako, Saitama 351-0198, Japan.
J Phys Condens Matter. 2021 Oct 7;33(50). doi: 10.1088/1361-648X/ac2928.
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⋅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⋅effective model with linear dispersion, detailed derivations about the quantization of CPGE are given. Finally, according toanalysis 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.
圆光电流效应（CPGE）是手性外尔半金属和具有空间反演和镜面对称性破缺的多重半金属中唯一可能的量子化信号。在此，我们从CPGE张量的分类、有效模型和拓扑半金属RhSi族对CPGE的量子化等方面，对手性多重半金属中的CPGE进行综述。首先，我们对所有非磁点群的CPGE张量进行了完整的对称分析，得到了一个响应张量分类矩阵表。其次，CPGE在非中心对称拓扑半金属中成为一种量子化响应，并取决于多重费米子的陈数。基于具有线性色散的有效模型，给出了关于CPGE量子化的详细推导。最后，根据基于非相互作用电子结构对CPGE量子化的分析，我们回顾了先前的报道，并对RhSi族手性拓扑半金属进行了新的计算，这些半金属可分为两组。第一组包括RhSi、PtAl和CoSi，可能是呈现量子化CPGE迹线的有前景的候选者，而第二组包括PdGa、PtGa和RhSn，不具有量子化现象。
