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Nature Research, Nature Communications, 1(6), 2015

DOI: 10.1038/ncomms8779

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Landau level splitting in Cd3As2 under high magnetic fields

Journal article published in 2015 by Junzhi Cao, Sihang Liang, Cheng Zhang ORCID, Yanwen Liu, Junwei Huang, Zhao Jin, Zhi-Gang Chen ORCID, Zhijun Wang ORCID, Qisi Wang ORCID, Jun Zhao ORCID, Shiyan Li, Xi Dai, Jin Zou, Zhengcai Xia, Liang Li and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractThree-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.