Landau level splitting in Cd3As2 under high magnetic fields

Junzhi Cao, Sihang Liang, Cheng Zhang, Yanwen Liu, Junwei Huang, Zhao Jin, Zhi-Gang Chen, Zhijun Wang, Qisi Wang, Jun Zhao, Shiyan Li, Xi Dai, Jin Zou, Zhengcai Xia, Liang Li and Faxian Xiu ()
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Junzhi Cao: Fudan University
Sihang Liang: Fudan University
Cheng Zhang: Fudan University
Yanwen Liu: Fudan University
Junwei Huang: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology
Zhao Jin: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology
Zhi-Gang Chen: The University of Queensland
Zhijun Wang: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Qisi Wang: Fudan University
Jun Zhao: Fudan University
Shiyan Li: Fudan University
Xi Dai: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Jin Zou: The University of Queensland
Zhengcai Xia: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology
Liang Li: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology
Faxian Xiu: Fudan University

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8779

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