globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1917697117
论文题名:
Bond-breaking induced lifshitz transition in robust dirac semimetal VAI3
作者: Liu Y.; Liu Y.-F.; Gui X.; Xiang C.; Zhou H.-B.; Hsu C.-H.; Lin H.; Chang T.-R.; Xie W.; Jia S.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:27
起始页码: 15517
结束页码: 15523
语种: 英语
英文关键词: Chemical bond ; Dirac electron ; Electron count ; Lifshitz transition
Scopus关键词: article ; chemical bond ; electron ; gravity ; substitution reaction
英文摘要: Topological electrons in semimetals are usually vulnerable to chemical doping and environment change, which restricts their potential application in future electronic devices. In this paper, we report that the type-II Dirac semimetal VAl3 hosts exceptional, robust topological electrons which can tolerate extreme change of chemical composition. The Dirac electrons remain intact, even after a substantial part of V atoms have been replaced in the V1-xTixAl3solid solutions. This Dirac semimetal state ends at x = 0:35, where a Lifshitz transition to p-type trivial metal occurs. The V-Al bond is completely broken in this transition as long as the bonding orbitals are fully depopulated by the holes donated from Ti substitution. In other words, the Dirac electrons in VAl3are protected by the V-Al bond, whose molecular orbital is their bonding gravity center. Our understanding on the interrelations among electron count, chemical bond, and electronic properties in topological semimetals suggests a rational approach to search robust, chemical-bond-protected topological materials. © 2020 National Academy of Sciences. All rights reserved.
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被引频次[WOS]:8   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163445
Appears in Collections:气候变化与战略

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作者单位: Liu, Y., International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China; Liu, Y.-F., International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China; Gui, X., Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, United States; Xiang, C., International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China; Zhou, H.-B., International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China; Hsu, C.-H., Department of Physics, National University of Singapore, Singapore, 117542, Singapore, Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117546, Singapore; Lin, H., Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan; Chang, T.-R., Department of Physics, National Cheng Kung University, Tainan, 701, Taiwan, Center for Quantum Frontiers of Research & Technology, National Cheng Kung University, Tainan, 701, Taiwan, Physics Division, National Center for Theoretical Sciences, Hsinchu, 30013, Taiwan; Xie, W., Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, United States; Jia, S., International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China, Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China, CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, 100190, China, Quantum Materials and Devices Division, Beijing Academy of Quantum Information Sciences, Beijing, 100193, China

Recommended Citation:
Liu Y.,Liu Y.-F.,Gui X.,et al. Bond-breaking induced lifshitz transition in robust dirac semimetal VAI3[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(27)
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