Symmetry-Protected Topological Triangular Weyl Complex

Wang, R.1,2,3,4,5; Xia, B. W.1,2; Chen, Z. J.1,2,6; Zheng, B. B.1,2; Zhao, Y. J.6; Xu, H.1,2,7

2020-03-10

10.1103/PhysRevLett.124.105303

PHYSICAL REVIEW LETTERS   影响因子和分区

0031-9007

1079-7114

Weyl points are often believed to appear in pairs with opposite chirality. In this work, we show by first-principles calculations and symmetry analysis that single Weyl phonons with linear dispersion and double Weyl phonons with quadratic dispersion are simultaneously present between two specific phonon branches in realistic materials with trigonal or hexagonal lattices. These phonon Weyl points are guaranteed to locate at high-symmetry points due to the screw rotational symmetry, forming a unique triangular Weyl complex. In sharp contrast to conventional Weyl systems with surface arcs terminated at the projections of a pair of Weyl points with opposite chirality, the phonon surface arcs of the unconventional triangular Weyl complex connect the projections of one double Weyl point and two single Weyl points. Importantly, the phonon surface arcs originating from the triangular Weyl complex are extremely long and span the entire surface Brillouin zone. Furthermore, there are only nontrivial phonon surface states across the isofrequency surface, which facilitates their detection in experiments and further applications. Our work not only offers the promising triangular phonon Weyl complex but also provides guidance for exploring triangular Weyl bosons in both phononic and photonic systems.

SCI ; EI

英语

NI论文

第一 ; 通讯

fund of the Guangdong Provincial Key Laboratory of Computational Science and Material Design[2019B030301001]

Physics

Physics, Multidisciplinary

WOS:000518820000018

AMER PHYSICAL SOC

20201708554961

Chirality ; Calculations ; Dispersions

Mathematics:921 ; Atomic and Molecular Physics:931.3 ; Materials Science:951

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
3.Chongqing Univ, Inst Struct & Funct, Chongqing 400044, Peoples R China
4.Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
5.Chongqing Univ, Ctr Quantum Mat & Devices, Chongqing 400044, Peoples R China
6.South China Univ Technol, Dept Phys, Guangzhou 510640, Peoples R China
7.Southern Univ Sci & Technol, Guangdong Prov Key Lab Computat Sci & Mat Design, Shenzhen 518055, Peoples R China

Wang, R.,Xia, B. W.,Chen, Z. J.,et al. Symmetry-Protected Topological Triangular Weyl Complex[J]. PHYSICAL REVIEW LETTERS,2020,124(10).

Wang, R.,Xia, B. W.,Chen, Z. J.,Zheng, B. B.,Zhao, Y. J.,&Xu, H..(2020).Symmetry-Protected Topological Triangular Weyl Complex.PHYSICAL REVIEW LETTERS,124(10).

Wang, R.,et al."Symmetry-Protected Topological Triangular Weyl Complex".PHYSICAL REVIEW LETTERS 124.10(2020).