Magnetotransport in Dual-gated MoS<sub>2 </sub>van der Waals Heterostructure

ORAL

Abstract

Semiconductor transition metal dichalcogenides (TMDs) have attracted significant interest because of their unique combination of two-dimensional nature, large-band gap and strong spin-orbit interaction. Recent advances in contact engineering have allowed Ohmic contact to n-type [1] and p-type [2] TMDs thus enabling study of quantum transport phenomenon at cryogenic temperature. Combining the n-type contact scheme and MoS2-Boron Nitride (BN) dual-gated heterostructure, we are able to tune the contact and carrier densities of monolayer MoS2 independently and measure magnetotransport in the density range of 2-10x1012 cm-2. The samples display well-defined Shubnikov-de Haas (SdH) oscillations in high magnetic fields. From the temperature dependence of the SdH oscillation amplitude we determine an electron effective mass of 0.46 me for monolayer MoS2. [1] Cui, X.; Shih, E.-M. et al. Nano Lett. 2017, 17, 4781–4786. [2] Movva, H. et al., ACS Nano 2015, 9, 10402–10.

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Presenters

  • En-Min Shih

    • Physics, Columbia Univ

Authors

  • En-Min Shih

    • Physics, Columbia Univ

  • Daniel Rhodes

    • Columbia Univ
    • Physics, Columbia Univ
    • Columbia University
    • Mechanical Engineering, Columbia University

  • Takashi Taniguchi

    • National Institute for Materials Science
    • NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science
    • Chemical Engineering, Kyoto Univ
    • Advanced materials laboratory, National institute for Materials Science

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • Advanced materials laboratory, National institute for Materials Science
    • NIMS-Japan

  • Cory Dean

    • Physics, Columbia University
    • Columbia University
    • Columbia Univ
    • Physics, Columbia Univ
    • physics, columbia university in the city of new york
    • Department of Physics, Columbia University