Spin-orbit coupling in the band structure WSe$_{2}$ monolayers

ORAL

Abstract

We have mapped the occupied band structure of monolayer WSe$_{2}$ by small spatial spot angle resolved photoemission and have found significant spin-orbit coupling in excess of 500 meV, far larger than for MoS$_{2}$. The experimental band mapping is consistent with theoretical expectations with the top of the valence band is seen at K, not $\Gamma $, thus distinct from the band structure for the bilayer and bulk single crystals. This shift of the top of the valence band in monolayer WSe$_{2}$, from $\Gamma $ to K, is also predicted in density functional theory. In general the wave vector dependent experimental band structure confirms the expectations of density functional theory.

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Authors

  • Iori Tanabe

    • Univ of Nebraska - Lincoln, Dept. of Physics and Astronomy

  • Alexei Barinov

    • Elettra Experimental Division, Sincrotrone Trieste

  • Duy Le

    • University of Central Florida, Department of Physics, Orlando FL 32816-2385, USA
    • University of Central Florida, Dept. of Physics

  • Edwin Preciado

    • University of California Riverside, Department of Chemistry
    • Univ of California - Riverside

  • Miguel Isarraraz

    • University of California Riverside, Department of Chemistry

  • Ludwig Bartels

    • University of California Riverside, Department of Chemistry

  • Talat S. Rahman

    • University of Central Florida, Department of Physics, Orlando FL 32816-2385, USA
    • Univ of Central Florida,Orlando,FL,32816
    • University of Central Florida, Dept. of Physics
    • University of Central Florida, Orlando, FL, 32816

  • Peter Dowben

    • University of Nebraska-Lincoln, Nebraska Center for Materials and Nanoscience
    • Univ of Nebraska - Lincoln, Dept. of Physics and Astronomy
    • University of Nebraska - Lincoln