Landau level splitting in Cd3As2 under high magnetic fields

Cao, Junzhi, Liang, Sihang, Zhang, Cheng, Liu, Yanwen, Huang, Junwei, Jin, Zhao, Chen, Zhi-Gang, Wang, Zhijun, Wang, Qisi, Zhao, Jun, Li, Shiyan, Dai, Xi, Zou, Jin, Xia, Zhengcai, Li, Liang and Xiu, Faxian (2015) Landau level splitting in Cd3As2 under high magnetic fields. Nature Communications, 6 7779: 1-6. doi:10.1038/ncomms8779


Author Cao, Junzhi
Liang, Sihang
Zhang, Cheng
Liu, Yanwen
Huang, Junwei
Jin, Zhao
Chen, Zhi-Gang
Wang, Zhijun
Wang, Qisi
Zhao, Jun
Li, Shiyan
Dai, Xi
Zou, Jin
Xia, Zhengcai
Li, Liang
Xiu, Faxian
Title Landau level splitting in Cd3As2 under high magnetic fields
Journal name Nature Communications   Check publisher's open access policy
ISSN 2041-1723
Publication date 2015-07-13
Year available 2015
Sub-type Article (original research)
DOI 10.1038/ncomms8779
Open Access Status DOI
Volume 6
Issue 7779
Start page 1
End page 6
Total pages 6
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Subject 1600 Chemistry
1300 Biochemistry, Genetics and Molecular Biology
3100 Physics and Astronomy
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.
Formatted 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.
Keyword Multidisciplinary Sciences
Science & Technology - Other Topics
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 61322407
Institutional Status UQ

 
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