Coexistent three-component and two-component Weyl phonons in TiS, ZrSe, and HfTe

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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.
刊名	PHYSICAL REVIEW B
	2018-02-12
卷号	97 期号:5 页码:-
关键词	Topological Dirac Semimetal Initio Molecular-dynamics Augmented-wave Method Fermi Arcs Wannier Functions Electron-gas Line-nodes Wc Type System Surface
ISSN号	2469-9950
英文摘要	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.; 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.
学科主题	Physics, Condensed Matter
语种	英语
资助机构	National Science Fund for Distinguished Young Scholars [51725103]; National Natural Science Foundation of China [51671193, 51474202]; Science Challenging Project [TZ2016004]; NSFC-Guangdong Joint Fund [U1501501]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79505]
专题	金属研究所_中国科学院金属研究所
通讯作者	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.
推荐引用方式 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):-.