Phononic Weyl nodal straight lines in MgB2
Li, Jiangxu1,2; Xie, Qing1,3; Liu, Jiaxi1,2; Li, Ronghan1; Liu, Min1,2; Wang, Lei1,2; Li, Dianzhong1; Li, Yiyi1; Chen, Xing-Qiu1
Corresponding AuthorChen, Xing-Qiu(
Source PublicationPHYSICAL REVIEW B
AbstractBased on first-principles calculations, we predict that the superconductor MgB2 with an AlB2-type centrosymmetric lattice hosts the so-called phononic topological Weyl nodal lines (PTWNLs) in its bulk phonon spectrum. These PTWNLs can be viewed as countless Weyl points (WPs) closely aligned along the straight lines in the -H-K-H direction within the three-dimensional Brillouin zone (BZ) and are always paired with opposite Berry phase. Their topologically nontrivial natures are confirmed by the calculated Berry curvature distributions on the planes perpendicular to these lines. These lines are unique, because they are located exactly at the high-symmetry boundary of the BZ protected by the mirror symmetry and, simultaneously, are straightly transverse to the whole BZ, differently from known classifications, including nodal rings, nodal chains or nets, and nodal loops. On the (10 (1) over bar0) crystal surface, the PTWNL-induced drumhead-like nontrivial surface states appear within the rectangular area confined by the projected lines of the PTWNLs. Moreover, when the mirror symmetry is broken, the double-degenerate PTWNLs are further lifted to form a pair of WPs with opposite chirality. Our results pave the way for future experimental study of topological phonons on MgB2 and highlight similar results in a series of isostructural AlB2-type metallic diborides.
Funding OrganizationNational Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; Science Challenging Project
Indexed BySCI
Funding ProjectNational Science Fund for Distinguished Young Scholars[51725103] ; National Natural Science Foundation of China[51671193] ; Science Challenging Project[TZ2016004]
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000505478700002
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Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorChen, Xing-Qiu
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li, Jiangxu,Xie, Qing,Liu, Jiaxi,et al. Phononic Weyl nodal straight lines in MgB2[J]. PHYSICAL REVIEW B,2020,101(2):7.
APA Li, Jiangxu.,Xie, Qing.,Liu, Jiaxi.,Li, Ronghan.,Liu, Min.,...&Chen, Xing-Qiu.(2020).Phononic Weyl nodal straight lines in MgB2.PHYSICAL REVIEW B,101(2),7.
MLA Li, Jiangxu,et al."Phononic Weyl nodal straight lines in MgB2".PHYSICAL REVIEW B 101.2(2020):7.
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