Observation of a thermoelectric Hall plateau in the extreme quantum limit

Wenjie Zhang, Peipei Wang, Brian Skinner, Ran Bi, Vladyslav Kozii, Chang-Woo Cho, Ruidan Zhong, John Schneeloch, Dapeng Yu, Genda Gu, Liang Fu (), Xiaosong Wu () and Liyuan Zhang ()
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Wenjie Zhang: Beijing Key Laboratory of Quantum Devices, Peking University
Peipei Wang: Southern University of Science and Technology
Brian Skinner: Massachusetts Institute of Technology
Ran Bi: Beijing Key Laboratory of Quantum Devices, Peking University
Vladyslav Kozii: Massachusetts Institute of Technology
Chang-Woo Cho: Southern University of Science and Technology
Ruidan Zhong: Brookhaven National Laboratory
John Schneeloch: Brookhaven National Laboratory
Dapeng Yu: Southern University of Science and Technology
Genda Gu: Brookhaven National Laboratory
Liang Fu: Massachusetts Institute of Technology
Xiaosong Wu: Beijing Key Laboratory of Quantum Devices, Peking University
Liyuan Zhang: Southern University of Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-5

Abstract: Abstract The thermoelectric Hall effect is the generation of a transverse heat current upon applying an electric field in the presence of a magnetic field. Here, we demonstrate that the thermoelectric Hall conductivity αxy in the three-dimensional Dirac semimetal ZrTe5 acquires a robust plateau in the extreme quantum limit of magnetic field. The plateau value is independent of the field strength, disorder strength, carrier concentration, or carrier sign. We explain this plateau theoretically and show that it is a unique signature of three-dimensional Dirac or Weyl electrons in the extreme quantum limit. We further find that other thermoelectric coefficients, such as the thermopower and Nernst coefficient, are greatly enhanced over their zero-field values even at relatively low fields.

Date: 2020
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DOI: 10.1038/s41467-020-14819-7

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