Coexistence of charge-2 Dirac and Weyl phonons in chiral space groups
Unconventional topological phonons with unusual properties in crystalline solids have attracted increasing attention. By performing symmetry arguments and low-energy effective Hamiltonian, we confirm the coexistence of charge-2 Dirac and Weyl phonons at high-symmetry points and high-symmetry lines by analyzing all possible space groups. We reveal that such a particular system only emerges in chiral space groups in the presence of time-reversal symmetry. Unlike conventional Weyl pairs with opposite chirality that host one surface arc, there are two surface arcs by connecting one charge-2 Dirac point with topological charge = ±2 and two Weyl points with topological charge = 1. Due to the constraints of symmetry arguments and projection direction in chiral crystals, the surface arcs are long enough to span over the whole surface Brillouin zone. We take Na2Zn2O3 as an example to confirm our predication, and two branches of surface states across the whole surface Brillouin zone are clearly visible. Our work not only presents exotic quasiparticles but also provides an idea for realizing long nontrivial surface arcs.
NI Journal Papers
First ; Corresponding
National Natural Science Foundation of China ; Science, Technology, and Innovation Commission of Shenzhen Municipality["RCYX20200714114523069","ZDSYS20190902092905285"] ; fund of theGuangdong Provincial Key Laboratory of Computational Science and Material Design[2019B030301001]
|WOS Research Area|
Materials Science ; Physics
Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
|WOS Accession No|
|EI Accession Number|
Crystal symmetry ; Sodium compounds ; Topology ; Zinc compounds
|ESI Classification Code|
Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Crystal Lattice:933.1.1
|ESI Research Field|
Cited Times [WOS]:8
|Document Type||Journal Article|
|Department||Department of Physics|
1.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Physics,The Hong Kong University of Science and Technology,Hong Kong,Clear Water Bay,999077,Hong Kong
3.Songshan Lake Materials Laboratory,Dongguan,Guangdong,523808,China
4.Division of Physics and Applied Physics,School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore,637371,Singapore
5.Department of Physics,South China University of Technology,Guangzhou,510640,China
6.Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices,Southern University of Science and Technology,Shenzhen,518055,China
7.Guangdong Provincial Key Laboratory of Computational Science and Material Design,Southern University of Science and Technology,Shenzhen,518055,China
|First Author Affilication||Department of Physics|
|Corresponding Author Affilication||Department of Physics; Southern University of Science and Technology|
|First Author's First Affilication||Department of Physics|
Liu，Guang,Huang，Zhenqiao,Chen，Zhongjia,et al. Coexistence of charge-2 Dirac and Weyl phonons in chiral space groups[J]. Physical Review B,2022,106(5).
Liu，Guang,Huang，Zhenqiao,Chen，Zhongjia,Jin，Yuanjun,He，Changchun,&Xu，Hu.(2022).Coexistence of charge-2 Dirac and Weyl phonons in chiral space groups.Physical Review B,106(5).
Liu，Guang,et al."Coexistence of charge-2 Dirac and Weyl phonons in chiral space groups".Physical Review B 106.5(2022).
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