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Tuning magnetotransport in a compensated semimetal at the atomic scale

Author

Listed:
  • Lin Wang

    (Universite de Geneva
    Group of Applied Physics, Universite de Geneva)

  • Ignacio Gutiérrez-Lezama

    (Universite de Geneva
    Group of Applied Physics, Universite de Geneva)

  • Céline Barreteau

    (Universite de Geneva)

  • Nicolas Ubrig

    (Universite de Geneva
    Group of Applied Physics, Universite de Geneva)

  • Enrico Giannini

    (Universite de Geneva)

  • Alberto F. Morpurgo

    (Universite de Geneva
    Group of Applied Physics, Universite de Geneva)

Abstract

Either in bulk form, or in atomically thin crystals, layered transition metal dichalcogenides continuously reveal new phenomena. The latest example is 1T’-WTe2, a semimetal found to exhibit the largest known magnetoresistance in the bulk, and predicted to become a topological insulator in strained monolayers. Here we show that reducing the thickness through exfoliation enables the electronic properties of WTe2 to be tuned, which allows us to identify the mechanisms responsible for the observed magnetotransport down to the atomic scale. The longitudinal resistance and the unconventional magnetic field dependence of the Hall resistance are reproduced quantitatively by a classical two-band model for crystals as thin as six monolayers, whereas a crossover to an Anderson insulator occurs for thinner crystals. Besides establishing the origin of the magnetoresistance of WTe2, our results represent a complete validation of the classical theory for two-band electron-hole transport, and indicate that atomically thin WTe2 layers remain gapless semimetals.

Suggested Citation

  • Lin Wang & Ignacio Gutiérrez-Lezama & Céline Barreteau & Nicolas Ubrig & Enrico Giannini & Alberto F. Morpurgo, 2015. "Tuning magnetotransport in a compensated semimetal at the atomic scale," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9892
    DOI: 10.1038/ncomms9892
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    Cited by:

    1. Yotam Wolf & Amit Aharon-Steinberg & Binghai Yan & Tobias Holder, 2023. "Para-hydrodynamics from weak surface scattering in ultraclean thin flakes," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Teng Ma & Hao Chen & Kunihiro Yananose & Xin Zhou & Lin Wang & Runlai Li & Ziyu Zhu & Zhenyue Wu & Qing-Hua Xu & Jaejun Yu & Cheng Wei Qiu & Alessandro Stroppa & Kian Ping Loh, 2022. "Growth of bilayer MoTe2 single crystals with strong non-linear Hall effect," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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