Single pair of charge-2 high-fold fermions with surface type-II Van Hove singularities in ultralight chiral crystals

Xiao, Xiaoliang1,2; Jin, Yuanjun3; Ma, Da-Shuai1,2,4; Wei, Haoran1,2; Fan, Jing5; Wang, Rui1,2,4,6; Wu, Xiaozhi1,2,6

2024-04-19

10.1103/PhysRevB.109.165136

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

The realization of the single -pair fermions in electronic systems remains challenging in topology physics, especially for the systems with larger chiral charges C . In this work, based on the symmetry analysis, low -energy effective models, and first -principles calculations, we identify the single -pair charge -two chiral fermions in cubic lattices. We first derive the minimal lattice model that exhibits a single pair of Weyl points with the opposite chiral charges of C = +/- 2. Furthermore, we show the ultralight chiral crystal P4 3 32 -type LiC 2 and its mirror enantiomer as high -quality candidate materials, which exhibit large energy windows to surmount the interruption of irrelevant bands. Since two enantiomers are connected by the mirror symmetry, we observe the opposite chiral charges C and the reversal of Fermi -arc connections, showing the correspondence of chirality in the momentum space and the real space. In addition, we also reveal type -II van Hove singularities on the helicoid surfaces, which may induce chirality-locked charge density waves on the crystal surface. Our work not only provides a promising platform for controlling the sign of chiral charge through structural chirality but also facilitates the exploration of electronic correlations on the surface of ultralight chiral crystals.

SCI ; EI

英语

其他

National Natural Sci-ence Foundation of China (NSFC)["12174040","12204074","12222402","12347101"] ; China Na-tional Postdoctoral Program for Innovative Talent[BX20220367] ; Chongqing Natural Science Foundation[cstc2020jcyj-msxmX0118]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001231936700004

AMER PHYSICAL SOC

PHYSICS

Web of Science

1.Chongqing Univ, Inst Struct & Funct, Chongqing 400044, Peoples R China
2.Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
3.South China Normal Univ, Guangdong Basic Res Ctr Excellence Struct & Fundam, Sch Phys, Guangdong Prov Key Lab Quantum Engn & Quantum Mat, Guangzhou 510006, Peoples R China
4.Chongqing Univ, Ctr Quantum Mat & Devices, Chongqing 400044, Peoples R China
5.Southern Univ Sci & Technol, Ctr Computat Sci & Engn, Shenzhen 518055, Peoples R China
6.Chongqing Key Lab Strongly Coupled Phys, Chongqing 400044, Peoples R China

Xiao, Xiaoliang,Jin, Yuanjun,Ma, Da-Shuai,et al. Single pair of charge-2 high-fold fermions with surface type-II Van Hove singularities in ultralight chiral crystals[J]. PHYSICAL REVIEW B,2024,109(16).

Xiao, Xiaoliang.,Jin, Yuanjun.,Ma, Da-Shuai.,Wei, Haoran.,Fan, Jing.,...&Wu, Xiaozhi.(2024).Single pair of charge-2 high-fold fermions with surface type-II Van Hove singularities in ultralight chiral crystals.PHYSICAL REVIEW B,109(16).

Xiao, Xiaoliang,et al."Single pair of charge-2 high-fold fermions with surface type-II Van Hove singularities in ultralight chiral crystals".PHYSICAL REVIEW B 109.16(2024).