Interlayer quantum transport in Dirac semimetal BaGa2

Sheng Xu, Changhua Bao, Peng-Jie Guo, Yi-Yan Wang, Qiao-He Yu, Lin-Lin Sun, Yuan Su, Kai Liu, Zhong-Yi Lu, Shuyun Zhou and Tian-Long Xia ()
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Sheng Xu: Renmin University of China
Changhua Bao: Tsinghua University
Peng-Jie Guo: Renmin University of China
Yi-Yan Wang: Renmin University of China
Qiao-He Yu: Renmin University of China
Lin-Lin Sun: Renmin University of China
Yuan Su: Renmin University of China
Kai Liu: Renmin University of China
Zhong-Yi Lu: Renmin University of China
Shuyun Zhou: Tsinghua University
Tian-Long Xia: Renmin University of China

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract The quantum limit is quite easy to achieve once the band crossing exists exactly at the Fermi level (EF) in topological semimetals. In multilayered Dirac fermion systems, the density of Dirac fermions on the zeroth Landau levels (LLs) increases in proportion to the magnetic field, resulting in intriguing angle- and field-dependent interlayer tunneling conductivity near the quantum limit. BaGa2 is an example of a multilayered Dirac semimetal with its quasi-2D Dirac cone located at EF, providing a good platform to study its interlayer transport properties. In this paper, we report the negative interlayer magnetoresistance induced by the tunneling of Dirac fermions between the zeroth LLs of neighboring Ga layers in BaGa2. When the field deviates from the c-axis, the interlayer resistivity ρzz(θ) increases and finally results in a peak with the applied field perpendicular to the c-axis. These unusual interlayer transport properties are observed together in the Dirac semimetal under ambient pressure and are well explained by the model of tunneling between Dirac fermions in the quantum limit.

Date: 2020
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DOI: 10.1038/s41467-020-15854-0

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