Multiple Fermi pockets revealed by Shubnikov-de Haas oscillations in WTe2

Fei-Xiang Xiang; Menno Veldhorst; Shi-Xue Dou; Xiao-Lin Wang

doi:10.1209/0295-5075/112/37009

Multiple Fermi pockets revealed by Shubnikov-de Haas oscillations in WTe2

Materials Science 2015-11-30 v1 Strongly Correlated Electrons

Authors: Fei-Xiang Xiang , Menno Veldhorst , Shi-Xue Dou , Xiao-Lin Wang

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Abstract

We use magneto-transport measurements to investigate the electronic structure of WTe2 single crystals. A non-saturating and parabolic magnetoresistance is observed in the temperature range between 2.5 to 200 K and magnetic fields up to 8 T. Shubnikov - de Haas oscillations with beating patterns are observed. The fast Fourier transform of the SdH oscillations reveals three oscillation frequencies, corresponding to three pairs of Fermi pockets with comparable effective masses , m* ~ 0.31 me. By fitting the Hall resistivity, we infer the presence of one pair of electron pockets and two pairs of hole pockets, together with nearly perfect compensation of the electron-hole carrier concentration. These magnetotransport measurements reveal the complex electronic structure in WTe2, explaining the nonsaturating magnetoresistance.

Keywords

WTe2 Shubnikov-de Haas oscillations Fermi pockets magnetotransport effective mass carrier compensation

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@article{arxiv.1504.01460,
  title  = {Multiple Fermi pockets revealed by Shubnikov-de Haas oscillations in WTe2},
  author = {Fei-Xiang Xiang and Menno Veldhorst and Shi-Xue Dou and Xiao-Lin Wang},
  journal= {arXiv preprint arXiv:1504.01460},
  year   = {2015}
}

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Submitted to journal on 1 April, 2015, 4 Figures

Multiple Fermi pockets revealed by Shubnikov-de Haas oscillations in WTe2

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