Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2

doi:10.1021/acs.chemmater.8b02132

	Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2
	Xu, Chunqiang 1; Li, Bin 2; Jiao, Wenhe 3; Zhou, Wei 1; Qian, Bin 1; Sankar, Raman 4,5,8; Zhigadlo, Nikolai D.6; Qi, Yanpeng7 ; Qian, Dong 8; Chou, Fang-Cheng 4; Xu, Xiaofeng 1
	2018-07-24
发表期刊	CHEMISTRY OF MATERIALS
ISSN	0897-4756
卷号	30 期号:14 页码:4823-4830
发表状态	已发表
DOI	10.1021/acs.chemmater.8b02132
摘要	Type-II Dirac/Weyl semimetals are characterized by strongly tilted Dirac cones such that the Dirac/Weyl node emerges at the boundary of electron and hole pockets as a new state of quantum matter, distinct from the standard Dirac/Weyl points with a point-like Fermi surface which are referred to as type-I nodes. The type-II Dirac fermions were recently predicted by theory and have since been confirmed in experiments in the PtSerclass of transition metal dichalcogenides. However, the Dirac nodes observed in PtSe2, PdTe2, and PtTe2 candidates are quite far away from the Fermi level, making the signature of topological fermions obscure as the physical properties are still dominated by the non-Dirac quasiparticles. Here, we report the synthesis of a new type-II Dirac semimetal NiTe2 in which a pair of type-II Dirac nodes are located very close to the Fermi level. The quantum oscillations in this material reveal a nontrivial Berry's phase associated with these Dirac fermions. Our first-principles calculations further unveil a topological Dirac cone in its surface states. Therefore, NiTe2 may not only represent an improved system to formulate the theoretical understanding of the exotic consequences of type-II Dirac fermions, it also facilitates possible applications based on these topological carriers.
收录类别	EI ; SCIE ; SCI
语种	英语
资助项目	Wuhan National High Magnetic Field Center[2015KF15]
WOS研究方向	Chemistry ; Materials Science
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary
WOS记录号	WOS:000440105500041
出版者	AMER CHEMICAL SOC
EI入藏号	20182705519201
EI主题词	Calculations ; Fermi level ; Metalloids ; Nickel compounds ; Palladium compounds ; Platinum compounds ; Quantum theory ; Selenium compounds ; Topology ; Transition metals
WOS关键词	VAN-ALPHEN ; MAGNETORESISTANCE ; PDTE2
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/27637
专题	物质科学与技术学院物质科学与技术学院_PI研究组_齐彦鹏组
通讯作者	Sankar, Raman; Xu, Xiaofeng
作者单位	1.Changshu Inst Technol, Adv Funct Mat Lab, Dept Phys, Changshu 215500, Jiangsu, Peoples R China 2.Nanjing Univ Posts & Telecommun, Informat Phys Res Ctr, Nanjing 210023, Jiangsu, Peoples R China 3.Zhejiang Univ Sci & Technol, Dept Phys, Hangzhou 310023, Zhejiang, Peoples R China 4.Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan 5.Acad Sinica, Inst Phys, Taipei 11529, Taiwan 6.Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland 7.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 8.Shanghai Jiao Tong Univ, Sch Phys & Astron, Minist Educ, Key Lab Artificial Struct & Quantum Control, Shanghai 200240, Peoples R China
推荐引用方式 GB/T 7714	Xu, Chunqiang,Li, Bin,Jiao, Wenhe,et al. Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2[J]. CHEMISTRY OF MATERIALS,2018,30(14):4823-4830.
APA	Xu, Chunqiang.,Li, Bin.,Jiao, Wenhe.,Zhou, Wei.,Qian, Bin.,...&Xu, Xiaofeng.(2018).Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2.CHEMISTRY OF MATERIALS,30(14),4823-4830.
MLA	Xu, Chunqiang,et al."Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2".CHEMISTRY OF MATERIALS 30.14(2018):4823-4830.