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Phononic Weyl points and one-way topologically protected nontrivial phononic surface arc states in noncentrosymmetric WC-type materials
Xie, Qing; Li, Jiangxu; Ullah, Sami; Li, Ronghan; Wang, Lei; Li, Dianzhong; Li, Yiyi; Yunoki, Seiji; Chen, Xing-Qiu
2019-05-16
Source PublicationPHYSICAL REVIEW B
ISSN2469-9950
Volume99Issue:17
AbstractBy means of first-principles calculations, we have predicted the existence of phononic Weyl points (WPs) along the high-symmetric K(1/3, 1/3, 0)-H(1/3, 1/3, 1/2) line in the Brillouin zone for a series of noncentrosymmetric 3 1 , 2 hexagonal WC-type materials (HfS, HfSe, IrB, MoC, MoN, MoP, NbN, NbS, TaN, TaS, TiO, TiS, WN, ZrS, ZrSe, and ZrTe) and these WPs carry nonzero topological charges. In terms of symmetry analysis, we have further derived two-band k . p models to describe these WPs. For most WPs a first-order theory is sufficient to reproduce well the phonon spectra around these WPs. However, for some WPs a second-order theory has to be required. Particularly, when the second-order term plays a leading role, a topological charge +/- 1 WP on the K-H line is accompanied by three nearby WPs with the opposite charges (-/+ 1) off the K-H line. These four spatially close (in the reciprocal space) WPs have a total topological charge of -/+ 2. On the crystal (10 (1) over bar0) and (01 (1) over bar0) surfaces, we have observed clear one-way topologically protected nontrivial phononic surface arc states connecting two WPs with opposite chirality. Our results pave the way for future experimental studies of the topological phonons for those WC-type materials.
Indexed BySCI
Language英语
WOS IDWOS:000468204500001
PublisherAMER PHYSICAL SOC
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81086
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Xie, Qing,Li, Jiangxu,Ullah, Sami,et al. Phononic Weyl points and one-way topologically protected nontrivial phononic surface arc states in noncentrosymmetric WC-type materials[J]. PHYSICAL REVIEW B,2019,99(17).
APA Xie, Qing.,Li, Jiangxu.,Ullah, Sami.,Li, Ronghan.,Wang, Lei.,...&Chen, Xing-Qiu.(2019).Phononic Weyl points and one-way topologically protected nontrivial phononic surface arc states in noncentrosymmetric WC-type materials.PHYSICAL REVIEW B,99(17).
MLA Xie, Qing,et al."Phononic Weyl points and one-way topologically protected nontrivial phononic surface arc states in noncentrosymmetric WC-type materials".PHYSICAL REVIEW B 99.17(2019).
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