Topological massive Dirac fermions in beta-tungsten
Li, Jiangxu1,2; Ullah, Sami1,3; Li, Ronghan1,2; Liu, Mingfeng1,2; Cao, Hongtao4; Li, Dianzhong1; Li, Yiyi1; Chen, Xing-Qiu1
Corresponding AuthorChen, Xing-Qiu(
Source PublicationPHYSICAL REVIEW B
AbstractUltrathin films of beta-tungsten (beta-W) is attracting extensive attentions because of its promising application in spintronics due to giant spin Hall effect and its fundamental interest in superconductivity. By means of first-principles calculations, we have elucidated its nontrivial topological nature with multiple Dirac nodal lines in the beta-W metal when spin-orbit coupling (SOC) is ignored. The analysis of electronic structures reveal that its topology is associated with the band inversion between the d(xz) + d(yz) and d(z2) orbitals at the M point in its Brillouin zone. By switching on the SOC, these Dirac nodal lines become gapped, as accompanied with the occurrence of 24 massive Dirac fermions at the energy of 87 meV below the Fermi level. Different from the exact gapless Dirac fermions with the linear band crossings, we have identified that these massive Dirac fermions all open a tiny gap of 7 meV. In addition, we have observed the topologically protected nontrivial surface arc states connecting these massive Dirac fermions. The existence of these massive Dirac fermions in the beta-W phase would be important to understand its giant spin Hall effect according to a recent study [Nature 555, 638 (2018)] where massive Dirac fermions were identified to generate Berry-curvature-induced Hall conductivity.
Funding OrganizationNational Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China
Indexed BySCI
Funding ProjectNational Science Fund for Distinguished Young Scholars[51725103] ; National Natural Science Foundation of China[51671193] ; National Natural Science Foundation of China[51474202]
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000463888700008
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Cited Times:7[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
4.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China
Recommended Citation
GB/T 7714
Li, Jiangxu,Ullah, Sami,Li, Ronghan,et al. Topological massive Dirac fermions in beta-tungsten[J]. PHYSICAL REVIEW B,2019,99(16):7.
APA Li, Jiangxu.,Ullah, Sami.,Li, Ronghan.,Liu, Mingfeng.,Cao, Hongtao.,...&Chen, Xing-Qiu.(2019).Topological massive Dirac fermions in beta-tungsten.PHYSICAL REVIEW B,99(16),7.
MLA Li, Jiangxu,et al."Topological massive Dirac fermions in beta-tungsten".PHYSICAL REVIEW B 99.16(2019):7.
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