Paired charge-2 Weyl-Dirac phonons in tetragonal crystals

Wu，Peng1; Liu，Guang1; Hu，Xiangting1; Xu，Hu1,2,3

2023-08-01

10.1103/PhysRevB.108.054305

Physical Review B   Impact Factor & Quartile

2469-9950

2469-9969

Unconventional Weyl and Dirac phonons with topological charges of ±2 have attracted significant attention due to their exceptional properties. By employing a minimal lattice model, we propose that an ideal topological quasiparticle coexistence system can be achieved in chiral space groups 92 and 96. This system specifically incorporates a charge-2 Weyl phonon and a charge-2 Dirac phonon. Notably, the crystal symmetry restricts these two topological quasiparticles to high-symmetry points within the Brillouin zone, resulting in an ultralong surface arc that extends across the entire surface Brillouin zone. Moreover, the topological surface arcs exhibit a unique saddlelike surface feature. Taking BaPt2S3 as a representative example, we validate our prediction and reveal the interconnected ultralong surface arc and saddlelike topological surface state. Our work establishes a valuable framework for investigating diverse types of double Weyl nodes and presents a promising approach for detecting ultralong surface arcs.

English

NI Journal Papers

First

PHYSICS

2-s2.0-85167946334

Scopus

1.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
2.Quantum Science Center of Guangdong-Hong Kong,Shenzhen,Macao Greater Bay Area (Guangdong),518045,China
3.Shenzhen Key Laboratory for Advanced Quantum Functional Materials and Devices,Southern University of Science and Technology,Shenzhen,518055,China

Wu，Peng,Liu，Guang,Hu，Xiangting,et al. Paired charge-2 Weyl-Dirac phonons in tetragonal crystals[J]. Physical Review B,2023,108(5).

Wu，Peng,Liu，Guang,Hu，Xiangting,&Xu，Hu.(2023).Paired charge-2 Weyl-Dirac phonons in tetragonal crystals.Physical Review B,108(5).

Wu，Peng,et al."Paired charge-2 Weyl-Dirac phonons in tetragonal crystals".Physical Review B 108.5(2023).