Two-Dimensional Dirac Semimetals without Inversion Symmetry

Jin, Y. J.1,2,3; Zheng, B. B.4,5; Xiao, X. L.1,2,6; Chen, Z. J.1,2,7; Xu, Y.1,2; Xu, H.1,2

2020-09-10

10.1103/PhysRevLett.125.116402

PHYSICAL REVIEW LETTERS   影响因子和分区

0031-9007

1079-7114

Realizing stable two-dimensional (2D) Dirac points against spin-orbit coupling (SOC) has attracted much attention because it provides a platform to study the unique transport properties. In previous work, Young and Kane [Phys. Rev. Lett. 115, 126803 (2015) proposed stable 2D Dirac points with SOC, in which the Berry curvature and edge states vanish due to the coexistence of inversion and time-reversal symmetries. Herein, using the tight-binding model and k.p effective Hamiltonian, we present that 2D Dirac points can survive in the presence of SOC without inversion symmetry. Such 2D Dirac semimetals possess nonzero Berry curvature near the crossing nodes, and two edge states are terminated at one pair of Dirac points. In addition, according to symmetry arguments and high-throughput first-principles calculations, we identify a family of ideal 2D Dirac semimetals, which has nonzero Berry curvature in the vicinity of Dirac points and visible edge states, thus facilitating the experimental observations. Our work shows that 2D Dirac points can emerge without inversion symmetry, which not only enriches the classification of 2D topological semimetals but also provides a promising avenue to observe exotic transport phenomena beyond graphene, e.g., nonlinear Hall effect.

SCI ; EI

英语

NI论文

第一 ; 通讯

National Natural Science Foundation of China (NSFC)[11974160,11674148,11334004] ; Guangdong Natural Science Funds for Distinguished Young Scholars[2017B030306008]

Physics

Physics, Multidisciplinary

WOS:000567766000011

AMER PHYSICAL SOC

20204309379667

Transport properties ; Calculations

Agricultural Products:821.4 ; Mathematics:921 ; Physical Properties of Gases, Liquids and Solids:931.2

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.Univ Hong Kong, Dept Phys, Polcfulam Rd, Hong Kong, Peoples R China
4.Baoji Univ Arts & Sci, Coll Phys & Optoelect Technol, Baoji 721016, Peoples R China
5.Baoji Univ Arts & Sci, Adv Titanium Alloys & Funct Coatings Cooperat Inn, Baoji 721016, Peoples R China
6.Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
7.South China Univ Technol, Dept Phys, Guangzhou 510640, Peoples R China

Jin, Y. J.,Zheng, B. B.,Xiao, X. L.,et al. Two-Dimensional Dirac Semimetals without Inversion Symmetry[J]. PHYSICAL REVIEW LETTERS,2020,125(11).

Jin, Y. J.,Zheng, B. B.,Xiao, X. L.,Chen, Z. J.,Xu, Y.,&Xu, H..(2020).Two-Dimensional Dirac Semimetals without Inversion Symmetry.PHYSICAL REVIEW LETTERS,125(11).

Jin, Y. J.,et al."Two-Dimensional Dirac Semimetals without Inversion Symmetry".PHYSICAL REVIEW LETTERS 125.11(2020).