Paired charge-2 Weyl-Dirac phonons in tetragonal crystals
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.
NI Journal Papers
|ESI Research Field|
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||Department of Physics|
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
|First Author Affilication||Department of Physics|
|First Author's First Affilication||Department of Physics|
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).
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