Spin Polarized Hole Transport in Monolayer WSe<sub>2</sub> Quantum Structures

ORAL

Abstract

Challenges associated with low carrier mobility and the quality of electrical contacts in semiconducting transition metal dichalcogenides (TMDs) have hampered the progress of transport studies, especially at low temperature and low carrier density.

Here, we first present a device structure for achieving high mobility and low resistive ohmic contacts that relies on the independent tunability of the carrier density in the contact region. We demonstrate that low resistive ohmic contacts survive at temperatures as low as 10 mK and can successfully be used in hole transport measurements to probe the low carrier density regime in monolayer tungsten diselenide (WSe2).

We then report magneto-transport measurements performed in a perpendicular magnetic field up to 8 T. We discuss the appearance of a Landau fan diagram in which we observe fully spin polarized hole transport at low filling factors down to ν = 1. Finally, we discuss the behavior of the Landau fan diagram at higher densities, where we observe an unconventional alternating visibility pattern corresponding to the alternating population of the K and K’ valleys as the density is swept.

** This work was supported by the High Throughput and Secure Networks Challenge Program and the Quantum Sensors Challenge Program and NSERC ALLRP/578466-2022, NSERC Discovery Grant RGPIN-2019-05714, University of Ottawa Research Chair in Quantum Theory of Quantum Materials, Nanostructures, and Devices and CIFAR.

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Presenters

  • Antoine Labbé

    • University of Ottawa / National Research Council of Canada

Authors

  • Antoine Labbé

    • University of Ottawa / National Research Council of Canada

  • Justin Boddison-Chouinard

    • National Research Council Canada / University of Ottawa

  • Alex Bogan

    • National Research Council Canada
    • National Research Council of Canada

  • Pedro J Barrios

    • National Research Council Canada
    • National Research Council of Canada

  • Philip Waldron

    • National Research Council Canada
    • National Research Council of Canada

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Material Science, Tsukuba, Japan
    • National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Takashi Taniguchi

    • National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Marek Korkusinski

    • Natl Res Council
    • National Research Council of Canada

  • Adina A Luican-Mayer

    • University of Ottawa

  • Louis Gaudreau

    • Natl Res Council
    • National Research Council Canada