中国物理B ›› 2023, Vol. 32 ›› Issue (11): 116301-116301.doi: 10.1088/1674-1056/aceaea

所属专题： SPECIAL TOPIC — Celebrating the 100th Anniversary of Physics Discipline of Northwest University

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Straight and twisted Weyl nodal line phonons in Ho2CF2 material

Xin-Yue Kang(康鑫越)1,2, Jin-Yang Li(李金洋)1,2, and Si Li(李思)1,2,†   

  1. 1 School of Physics, Northwest University, Xi'an 710127, China;
    2 Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi'an 710127, China
  • 收稿日期:2023-06-12 修回日期:2023-07-17 接受日期:2023-07-27 出版日期:2023-10-16 发布日期:2023-10-31
  • 通讯作者: Si Li E-mail:sili@nwu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 12204378).

Straight and twisted Weyl nodal line phonons in Ho2CF2 material

Xin-Yue Kang(康鑫越)1,2, Jin-Yang Li(李金洋)1,2, and Si Li(李思)1,2,†   

  1. 1 School of Physics, Northwest University, Xi'an 710127, China;
    2 Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi'an 710127, China
  • Received:2023-06-12 Revised:2023-07-17 Accepted:2023-07-27 Online:2023-10-16 Published:2023-10-31
  • Contact: Si Li E-mail:sili@nwu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 12204378).

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摘要： Based on first-principles calculations, symmetry analysis and model construction, we predict that Ho2CF2 hosts both straight and twisted Weyl nodal lines in its bulk phonon spectrum. We identify that the top two phonon bands entangle with each other, forming two straight Weyl nodal lines on the K-H and K'-H' paths at the Brillouin zone (BZ) boundary, and six twisted Weyl nodal lines within the BZ. All the Weyl nodal lines along the kz direction and across the entire BZ. The symmetry analysis indicates that these Weyl nodal lines are protected by the PT symmetry and crystal symmetry. The Berry phase and drumhead-like nontrivial surface states are calculated. We also construct a tight-binding model to describe these nodal lines. Our work provides an excellent material platform for exploring the fascinating physics associated with straight and twisted Weyl nodal line phonons.

关键词: topological quasiparticles, topological phonons, straight nodal lines, twisted nodal lines

Abstract: Based on first-principles calculations, symmetry analysis and model construction, we predict that Ho2CF2 hosts both straight and twisted Weyl nodal lines in its bulk phonon spectrum. We identify that the top two phonon bands entangle with each other, forming two straight Weyl nodal lines on the K-H and K'-H' paths at the Brillouin zone (BZ) boundary, and six twisted Weyl nodal lines within the BZ. All the Weyl nodal lines along the kz direction and across the entire BZ. The symmetry analysis indicates that these Weyl nodal lines are protected by the PT symmetry and crystal symmetry. The Berry phase and drumhead-like nontrivial surface states are calculated. We also construct a tight-binding model to describe these nodal lines. Our work provides an excellent material platform for exploring the fascinating physics associated with straight and twisted Weyl nodal line phonons.

Key words: topological quasiparticles, topological phonons, straight nodal lines, twisted nodal lines

中图分类号:  (Phonon states and bands, normal modes, and phonon dispersion)

  • 63.20.D-
03.65.Vf (Phases: geometric; dynamic or topological) 03.75.Lm (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations) 73.20.-r (Electron states at surfaces and interfaces)