Magnetic impurity in hybrid and type-II nodal line semimetals

doi:10.1088/1674-1056/abfa02

中国物理B ›› 2021, Vol. 30 ›› Issue (6): 67103-067103.doi: 10.1088/1674-1056/abfa02

Magnetic impurity in hybrid and type-II nodal line semimetals

Xiao-Rong Yang(杨晓容), Zhen-Zhen Huang(黄真真), Wan-Sheng Wang(王万胜), and Jin-Hua Sun(孙金华)^†

Department of Physics, Ningbo University, Ningbo 315211, China

收稿日期:2021-03-25 修回日期:2021-04-15 接受日期:2021-04-21 出版日期:2021-05-18 发布日期:2021-05-27
通讯作者: Jin-Hua Sun E-mail:sunjinhua@nbu.edu.cn
基金资助:
Project supported by the Zhejiang Provincial Natural Science Foundation of China (Grant No. LY19A040003).

Magnetic impurity in hybrid and type-II nodal line semimetals

Xiao-Rong Yang(杨晓容), Zhen-Zhen Huang(黄真真), Wan-Sheng Wang(王万胜), and Jin-Hua Sun(孙金华)^†

Department of Physics, Ningbo University, Ningbo 315211, China

Received:2021-03-25 Revised:2021-04-15 Accepted:2021-04-21 Online:2021-05-18 Published:2021-05-27
Contact: Jin-Hua Sun E-mail:sunjinhua@nbu.edu.cn
Supported by:
Project supported by the Zhejiang Provincial Natural Science Foundation of China (Grant No. LY19A040003).

摘要/Abstract

摘要： We study the Kondo screening of a spin-1/2 magnetic impurity in the hybrid nodal line semimetals (NLSMs) and the type-II NLSMs by using the variational method. We mainly study the binding energy and the spin-spin correlation between magnetic impurity and conduction electrons. We find that in both the hybrid and type-II cases, the density of states (DOS) is always finite, so the impurity and the conduction electrons always form bound states, and the bound state is more easily formed when the DOS is large. Meanwhile, due to the unique dispersion relation and the spin-orbit couplings in the NLSMs, the spatial spin-spin correlation components show very interesting features. Most saliently, various components of the spatial spin-spin correlation function decay with 1/r² in the hybrid NLSMs, while they follow 1/r³ decay in the type-II NLSMs. This property is mainly caused by the special band structures in the NLSMs, and it can work as a fingerprint to distinguish the two types of NLSMs.

关键词: hybrid nodal line semimetals, type-II nodal line semimetals, Anderson impurity, Kondo screening

Abstract: We study the Kondo screening of a spin-1/2 magnetic impurity in the hybrid nodal line semimetals (NLSMs) and the type-II NLSMs by using the variational method. We mainly study the binding energy and the spin-spin correlation between magnetic impurity and conduction electrons. We find that in both the hybrid and type-II cases, the density of states (DOS) is always finite, so the impurity and the conduction electrons always form bound states, and the bound state is more easily formed when the DOS is large. Meanwhile, due to the unique dispersion relation and the spin-orbit couplings in the NLSMs, the spatial spin-spin correlation components show very interesting features. Most saliently, various components of the spatial spin-spin correlation function decay with 1/r² in the hybrid NLSMs, while they follow 1/r³ decay in the type-II NLSMs. This property is mainly caused by the special band structures in the NLSMs, and it can work as a fingerprint to distinguish the two types of NLSMs.

Key words: hybrid nodal line semimetals, type-II nodal line semimetals, Anderson impurity, Kondo screening

中图分类号: (Transition metals and alloys)

71.20.Be

75.20.Hr (Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions) 03.65.Vf (Phases: geometric; dynamic or topological) 71.27.+a (Strongly correlated electron systems; heavy fermions)

Xiao-Rong Yang(杨晓容), Zhen-Zhen Huang(黄真真), Wan-Sheng Wang(王万胜), and Jin-Hua Sun(孙金华). Magnetic impurity in hybrid and type-II nodal line semimetals[J]. 中国物理B, 2021, 30(6): 67103-067103.

Xiao-Rong Yang(杨晓容), Zhen-Zhen Huang(黄真真), Wan-Sheng Wang(王万胜), and Jin-Hua Sun(孙金华). Magnetic impurity in hybrid and type-II nodal line semimetals[J]. Chin. Phys. B, 2021, 30(6): 67103-067103.

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Magnetic impurity in hybrid and type-II nodal line semimetals

Magnetic impurity in hybrid and type-II nodal line semimetals

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