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Coexistent three-component and two-component Weyl phonons in TiS, ZrSe, and HfTe
Li, JX; Xie, Q; Ullah, S; Li, RH; Ma, H; Li, DZ; Li, YY; Chen, XQ; Chen, XQ (reprint author), Chinese Acad Sci, Univ Sci & Technol China, Sch Mat Sci & Engn, Inst Met Res,Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
2018-02-12
Source PublicationPHYSICAL REVIEW B
ISSN2469-9950
Volume97Issue:5Pages:-
AbstractIn analogy to various fermions of electrons in topological semimetals, topological mechanical states with two types of bosons, Dirac and Weyl bosons, were reported in some macroscopic systems of kHz frequency, and those with a type of doubly-Weyl phonons in atomic vibrational framework of THz frequency of solid crystals were recently predicted. Here, through first-principles calculations, we have reported that the phonon spectra of the WC-type TiS, ZrSe, and HfTe commonly host the unique triply degenerate nodal points (TDNPs) and single two-component Weyl points (WPs) in THz frequency. Quasiparticle excitations near TDNPs of phonons are three-component bosons, beyond the conventional and known classifications of Dirac, Weyl, and doubly-Weyl phonons. Moreover, we have found that both TiS and ZrSe have five pairs of type-I Weyl phonons and a pair of type-II Weyl phonons, whereas HfTe only has four pairs of type-I Weyl phonons. They carry nonzero topological charges. On the (10 (1) over bar0) crystal surfaces, we observe topological protected surface arc states connecting two WPs with opposite charges, which host modes that propagate nearly in one direction on the surface.; In analogy to various fermions of electrons in topological semimetals, topological mechanical states with two types of bosons, Dirac and Weyl bosons, were reported in some macroscopic systems of kHz frequency, and those with a type of doubly-Weyl phonons in atomic vibrational framework of THz frequency of solid crystals were recently predicted. Here, through first-principles calculations, we have reported that the phonon spectra of the WC-type TiS, ZrSe, and HfTe commonly host the unique triply degenerate nodal points (TDNPs) and single two-component Weyl points (WPs) in THz frequency. Quasiparticle excitations near TDNPs of phonons are three-component bosons, beyond the conventional and known classifications of Dirac, Weyl, and doubly-Weyl phonons. Moreover, we have found that both TiS and ZrSe have five pairs of type-I Weyl phonons and a pair of type-II Weyl phonons, whereas HfTe only has four pairs of type-I Weyl phonons. They carry nonzero topological charges. On the (10 (1) over bar0) crystal surfaces, we observe topological protected surface arc states connecting two WPs with opposite charges, which host modes that propagate nearly in one direction on the surface.
description.department[li, jiangxu ; xie, qing ; ullah, sami ; li, ronghan ; ma, hui ; li, dianzhong ; li, yiyi ; chen, xing-qiu] chinese acad sci, univ sci & technol china, sch mat sci & engn, inst met res,shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [xie, qing ; ullah, sami] univ chinese acad sci, beijing 100049, peoples r china
KeywordTopological Dirac Semimetal Initio Molecular-dynamics Augmented-wave Method Fermi Arcs Wannier Functions Electron-gas Line-nodes Wc Type System Surface
Subject AreaPhysics, Condensed Matter
Funding OrganizationNational Science Fund for Distinguished Young Scholars [51725103]; National Natural Science Foundation of China [51671193, 51474202]; Science Challenging Project [TZ2016004]; NSFC-Guangdong Joint Fund [U1501501]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79505
Collection中国科学院金属研究所
Corresponding AuthorChen, XQ (reprint author), Chinese Acad Sci, Univ Sci & Technol China, Sch Mat Sci & Engn, Inst Met Res,Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Li, JX,Xie, Q,Ullah, S,et al. Coexistent three-component and two-component Weyl phonons in TiS, ZrSe, and HfTe[J]. PHYSICAL REVIEW B,2018,97(5):-.
APA Li, JX.,Xie, Q.,Ullah, S.,Li, RH.,Ma, H.,...&Chen, XQ .(2018).Coexistent three-component and two-component Weyl phonons in TiS, ZrSe, and HfTe.PHYSICAL REVIEW B,97(5),-.
MLA Li, JX,et al."Coexistent three-component and two-component Weyl phonons in TiS, ZrSe, and HfTe".PHYSICAL REVIEW B 97.5(2018):-.
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