Landau level splitting in Cd3As2 under high magnetic fields

Cao, Junzhi and Liang, Sihang and Zhang, Cheng and Liu, Yanwen and Huang, Junwei and Jin, Zhao and Chen, Zhi-Gang and Wang, Zhijun and Wang, Qisi and Zhao, Jun and Li, Shiyan and Dai, Xi and Zou, Jin and Xia, Zhengcai and Li, Liang and Xiu, Faxian (2015) Landau level splitting in Cd3As2 under high magnetic fields. Nature Communications, 6. ISSN 2041-1723

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Abstract

Three-dimensional topological Dirac semimetals (TDSs) are a new kind of Dirac materials that exhibit linear energy dispersion in the bulk and can be viewed as three-dimensional graphene. It has been proposed that TDSs can be driven to other exotic phases like Weyl semimetals, topological insulators and topological superconductors by breaking certain symmetries. Here we report the first transport experiment on Landau level splitting in TDS Cd3As2 single crystals under high magnetic fields, suggesting the removal of spin degeneracy by breaking time reversal symmetry. The detected Berry phase develops an evident angular dependence and possesses a crossover from non-Trivial to trivial state under high magnetic fields, a strong hint for a fierce competition between the orbit-coupled field strength and the field-generated mass term. Our results unveil the important role of symmetry breaking in TDSs and further demonstrate a feasible path to generate a Weyl semimetal phase by breaking time reversal symmetry.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made available under Creative Commons Attribution License 4.0
Faculty / Department / School: No Faculty
Date Deposited: 21 Jun 2017 06:02
Last Modified: 21 Jun 2017 06:02
Fields of Research : 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030399 Macromolecular and Materials Chemistry not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1038/ncomms8779
URI: http://eprints.usq.edu.au/id/eprint/31692

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