Renormalization of the spin-orbit splitting in single-layer WS2 on h-BN

ORAL

Abstract

Transition metal dichalcogenides (TMDs) are of great interest due to a thickness dependent indirect to direct bandgap transition, large spin-orbit coupling, and spin-valley locking. In monolayer limit the TMDs have strong Coulomb interactions due to poor dielectric screening, resulting in strongly bound excitons. Interestingly, the electronic, optical and spin-valley related properties of TMDs can be tuned by surrounding dielectric environment and adatom doping due to many-body effects. We investigated the electronic band structure of single-layer (SL) WS2 on h-BN by angle-resolved photoemission (ARPES) with spatial resolution of 10μm sized spatial resolution of the μARPES endstation at the MAESTRO facility of the Advanced Light Source. We will discuss the effect of screening and ad-atom spin-orbit coupling on the trionic quasiparticles in the spectral function of SL WS2. Upon electron doping via alkali metal we observed giant spin-orbit splitting and bandgap renormalization in SL WS2.

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Presenters

  • Jyoti Katoch

    Department of Physics, Ohio State Univ - Columbus, Department of Physics, Ohio State University, Department of Physics, The Ohio State University

Authors

  • Jyoti Katoch

    Department of Physics, Ohio State Univ - Columbus, Department of Physics, Ohio State University, Department of Physics, The Ohio State University

  • Søren Ulstrup

    Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, Aarhus University, Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University

  • Roland Koch

    Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Naval Research laboratory

  • Simon Moser

    Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory

  • Kathleen McCreary

    U.S. Naval Research Lab, U.S. Naval Research Laboratory, Materials Science and Technology Division, U.S. Naval Research Laboratory, Naval Research Laboratory, Naval Research laboratory

  • Simranjeet Singh

    Department of Physics, The Ohio State University, Department of Physics, Ohio State Univ - Columbus, Ohio State University, Ohio State Univ - Columbus

  • Jinsong Xu

    Physics, Ohio State University - Columbus, Ohio State Univ - Columbus, Department of Physics, Ohio State Univ - Columbus, Department of Physics, The Ohio State University

  • Berend Jonker

    U.S. Naval Research Lab, U.S. Naval Research Laboratory, Materials Science and Technology Division, U.S. Naval Research Laboratory, Naval Research Laboratory, Materials Science and Technology Directorate, Naval Research Lab, Naval Research laboratory

  • Roland Kawakami

    Ohio State University, Department of Physics, The Ohio State University, The Ohio State University, Physics, The Ohio State University, Physics, Ohio State University - Columbus, Ohio State Univ - Columbus, Department of Physics, Ohio State Univ - Columbus, Physics, Ohio State Univ - Columbus

  • Aaron Bostwick

    Advanced light source, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Advanced Light Source, Lawrence Berkeley National Laboratory

  • Eli Rotenberg

    Advanced light source, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Advanced Light Source, Lawrence Berkeley National Laboratory

  • Chris Jozwiak

    Advanced light source, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Advanced Light Source, Lawrence Berkeley National Laboratory