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Frontiers of Physics

Front. Phys.    2020, Vol. 15 Issue (4) : 43201
Type-II topological metals
Si Li1,2(), Zhi-Ming Yu3, Yugui Yao3, Shengyuan A. Yang2
1. Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China
2. Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
3. Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology, Beijing 100081, China
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Topological metals (TMs) are a kind of special metallic materials, which feature nontrivial band crossings near the Fermi energy, giving rise to peculiar quasiparticle excitations. TMs can be classified based on the characteristics of these band crossings. For example, according to the dimensionality of the crossing, TMs can be classified into nodal-point, nodal-line, and nodal-surface metals. Another important property is the type of dispersion. According to degree of the tilt of the local dispersion around the crossing, we have type-I and type-II dispersions. This leads to significant distinctions in the physical properties of the materials, owing to their contrasting Fermi surface topologies. In this article, we briefly review the recent advances in this research direction, focusing on the concepts, the physical properties, and the material realizations of the type-II nodal-point and nodal-line TMs.

Keywords type-II      nodal point      nodal line      topological metals     
This article is part of themed collection: Recent Advances in Topological Materials (Eds. Yugui Yao, Xiangang Wan, Shengyuan A. Yang, Hua Chen)
Corresponding Author(s): Si Li   
Issue Date: 12 May 2020
 Cite this article:   
Si Li,Zhi-Ming Yu,Yugui Yao, et al. Type-II topological metals[J]. Front. Phys. , 2020, 15(4): 43201.
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Si Li
Zhi-Ming Yu
Yugui Yao
Shengyuan A. Yang
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