Topological origin of the type-II Dirac fermions in PtSe2

doi:10.1103/PhysRevMaterials.1.074202

	Topological origin of the type-II Dirac fermions in PtSe2
	Li, Yiwei 1; Xia, Yunyouyou2,3 ; Ekahana, Sandy Adhitia 1; Kumar, Nitesh 4; Jiang, Juan2,3,5 ; Yang, Lexian 6; Chen, Cheng 1; Liu, Chaoxing 7; Yan, Binghai 4; Felser, Claudia 4; Li, Gang2,3 ; Liu, Zhongkai2,3 ; Chen, Yulin1,2,3,6
	2017-12-22
发表期刊	PHYSICAL REVIEW MATERIALS
ISSN	2475-9953
卷号	1 期号:7
发表状态	已发表
DOI	10.1103/PhysRevMaterials.1.074202
摘要	Group VIII transition-metal dichalcogenides have recently been proposed to host type-II Dirac fermions. They are Lorentz-violating quasiparticles marked by a strongly tilted conic dispersion along a certain momentum direction and therefore have no analogs in the standard model. Using high-resolution angle-resolved photoemission spectroscopy, we systematically studied the electronic structure of PtSe2 in the full three-dimensional Brillouin zone. As predicted, a pair of type-II Dirac crossings is experimentally confirmed along the k(z) axis. Interestingly, we observed conic surface states around time-reversal-invariant momenta (Gamma) over bar and (M) over bar points. The signatures of nontrivial topology are confirmed by the first-principles calculation, which shows an intricate parity inversion of bulk states. Our discoveries not only contribute to a better understanding of topological band structure in PtSe2 but also help further explore the exotic properties, as well as potential application, of group VIII transition-metal dichalcogenides.
收录类别	SCI ; EI
语种	英语
资助项目	EPSRC (UK) Platform[EP/M020517/1]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000418774700002
出版者	AMER PHYSICAL SOC
EI入藏号	20191306694125
EI主题词	Calculations ; Electronic structure ; Photoelectron spectroscopy ; Platinum compounds ; Topology ; Transition metals
EI分类号	Metallurgy and Metallography:531 ; Mathematics:921 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4
WOS关键词	SURFACE-STATES ; SEMIMETAL ; SCHEMES ; BULK
原始文献类型	Article
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/16247
专题	物质科学与技术学院物质科学与技术学院_PI研究组_柳仲楷组物质科学与技术学院_PI研究组_李刚组物质科学与技术学院_特聘教授组_陈宇林物质科学与技术学院_博士生
通讯作者	Liu, Zhongkai; Chen, Yulin
作者单位	1.Univ Oxford, Dept Phys, Oxford OX1 3PU, England 2.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 3.CAS Shanghai Sci Res Ctr, Shanghai 201210, Peoples R China 4.Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany 5.Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA 6.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China 7.Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Li, Yiwei,Xia, Yunyouyou,Ekahana, Sandy Adhitia,et al. Topological origin of the type-II Dirac fermions in PtSe2[J]. PHYSICAL REVIEW MATERIALS,2017,1(7).
APA	Li, Yiwei.,Xia, Yunyouyou.,Ekahana, Sandy Adhitia.,Kumar, Nitesh.,Jiang, Juan.,...&Chen, Yulin.(2017).Topological origin of the type-II Dirac fermions in PtSe2.PHYSICAL REVIEW MATERIALS,1(7).
MLA	Li, Yiwei,et al."Topological origin of the type-II Dirac fermions in PtSe2".PHYSICAL REVIEW MATERIALS 1.7(2017).