Gate controllable spin filteration and spin separation in transition-metal-dichalcogenide monolayers for room temperature applications

ORAL

Abstract

Monolayer transition-metal dichalcogenides (TMDs) are semiconductors with direct gaps at the corners of the hexagonal Brillouin zone. Strong spin-orbit coupling in the absence of inversion symmetry yields spin-split valence bands in the TMDs around the two inequivalent valleys, which are almost fully spin-polarized without requiring magnetic fields. By exploiting these salient features of the electronic states, we propose two spintronics applications based on TMD monolayers, a spin-filter and a spin-separator. We demonstrate the high efficiency (output current with nearly 100% spin-polarization) of our proposed spin-filter/separator through quantum transport computations. Since spin-splitting energies range from 100-500 meV in the TMDs, our spin filter/separator is suitable for room temperature applications.

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Presenters

  • Cheng-Yi Huang

    • Academia Sinica

Authors

  • Cheng-Yi Huang

    • Academia Sinica

  • Wei-Feng Tsai

    • Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore

  • Mohammad Sadi

    • Engineering and Computer Engineering, National University of Singapore

  • Gaurav Gupta

    • Engineering and Computer Engineering, National University of Singapore

  • Tay-Rong Chang

    • Physics, National Cheng Kung University
    • National Cheng Kung University
    • Department of Physics, National Tsing Hua University
    • Natl Cheng Kung U.

  • Chuang-Han Hsu

    • Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    • National U. of Singapore

  • Horng-Tay Jeng

    • Academia Sinica
    • Department of Physics, National Tsing Hua University
    • Natl Tsing Hua Univ
    • National Tsing Hua University

  • Geng-Chiau Liang

    • Engineering and Computer Engineering, National University of Singapore

  • Hsin Lin

    • Academia Sinica
    • National University of Singapore
    • Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    • Institute of Physics, Academica Sinica
    • Institute of Physics, Academia Sinica
    • National U. of Singapore
    • Natl Univ of Singapore
    • National University of Signapore

  • Arun Bansil

    • Physics, Northeastern University
    • Department of Physics, Northeastern University
    • Northeastern University
    • Physics, Northeastern Univ