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