Spin-Valley pumping and long electron spin transport in a transition metal dichalcogenide monolayer

ORAL  · Invited

Abstract

Monolayers of transition metal dichalcogenides (TMD) are ideal semiconductor materials to control both spin and valley degrees of freedom either electrically or optically. Nevertheless, optical excitation mostly generates excitons species with inherently short lifetime and spin/valley relaxation time. In this presentation we will show that we can strongly polarize (up to 75%) the resident electrons in n-doped WSe2 and WS2 monolayers by using a circularly polarized continuous wave laser [1]. Then, using a spatially-resolved optical pump-probe experiment, we measure the lateral transport of spin/valley polarized electrons over very long distances (tens of micrometers) [2]. These results highlight the key role played by the spin-valley locking effect in TMD monolayers on the pumping efficiency and the polarized electron transport.

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Publication: [1] C. Robert et al., Spin/Valley Pumping of Resident Electrons in WSe2 and WS2 Monolayers, Nat. Comm. 12, 5455 (2021).
[2] L. Ren et al., Optical detection of long electron spin transport lengths in a monolayer semiconductor, Phys. Rev. Lett. 129, 027402 (2022)

Presenters

  • Cedric ROBERT

    • Institut National des Sciences Appliquee CNRS-LPCNO-INSA
    • Institut National des Sciences Appliquees de Toulouse

Authors

  • Cedric ROBERT

    • Institut National des Sciences Appliquee CNRS-LPCNO-INSA
    • Institut National des Sciences Appliquees de Toulouse

  • Lei REN

    • Institut National des Sciences Appliquee CNRS-LPCNO-INSA

  • Sangjun Park

    • PMC Ecole Polytechnique

  • Fabian Cadiz

    • PMC Ecole Polytechnique

  • Dorian Beret

    • Institut National des Sciences Appliquee CNRS-LPCNO-INSA

  • Hans Tornatzky

    • Institut National des Sciences Appliquee CNRS-LPCNO-INSA

  • Delphine Lagarde

    • Institut National des Sciences Appliquee CNRS-LPCNO-INSA
    • INSA/CNRS

  • Pierre Renucci

    • Institut National des Sciences Appliquee CNRS-LPCNO-INSA

  • Thierry Amand

    • Institut National des Sciences Appliquee CNRS-LPCNO-INSA
    • INSA/CNRS

  • Alistair Rowe

    • Ecole Polytechnique

  • Daniel Paget

    • PMC Ecole Polytechnique

  • Fausto Sirotti

    • Laboratoire de Physique Matiere Condensee

  • Min Yang

    • University of Rochester

  • Van Tuan Dinh

    • University of Rochester

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Scott A Crooker

    • Los Alamos National Laboratory

  • Hanan Dery

    • University of Rochester

  • Xavier Marie

    • INSA University of Toulouse