Topological massive Dirac fermions in beta-tungsten

doi:10.1103/PhysRevB.99.165110

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	Topological massive Dirac fermions in beta-tungsten
	Li, Jiangxu 2,4; Ullah, Sami 3,4; Li, Ronghan 2,4; Liu, Mingfeng 2,4; Cao, Hongtao 1; Li, Dianzhong 4; Li, Yiyi 4; Chen, Xing-Qiu 4
刊名	PHYSICAL REVIEW B
	2019-04-08
卷号	99 期号:16 页码:7
ISSN号	2469-9950
DOI	10.1103/PhysRevB.99.165110
通讯作者	Chen, Xing-Qiu(xingqiu.chen@imr.ac.cn)
英文摘要	Ultrathin 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.
资助项目	National Science Fund for Distinguished Young Scholars[51725103] ; National Natural Science Foundation of China[51671193] ; National Natural Science Foundation of China[51474202]
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000463888700008
资助机构	National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/132996]
专题	金属研究所_中国科学院金属研究所
通讯作者	Chen, Xing-Qiu
作者单位	1.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, 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, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 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.