Optically and Electrically Controllable Adatom Spin–orbital Dynamics in Transition Metal Dichalcogenides

ORAL

Abstract

We analyze the interplay of spin-valley coupling, orbital physics, and magnetic anisotropy taking place at single magnetic atoms adsorbed on semiconducting transition metal dichalcogenides, MX2 (M = Mo, W; X = S, Se). Orbital selection rules turn out to govern the kinetic exchange coupling between the adatom and charge carriers in the MX2 and lead to highly orbitally dependent spin-flip scattering rates, as we illustrate for the example of transition metal adatoms with d9 configuration. Our ab initio calculations suggest that d9 configurations are realizable by single Co, Rh, or Ir adatoms on MoS2, which additionally exhibit a sizable magnetic anisotropy. We find that the interaction of the adatom with carriers in the MX2 allows to tune its behavior from a quantum regime with full Kondo screening to a regime of ”Ising spintronics” where its spin–orbital moment acts as classical bit, which can be erased and written electronically and optically.

*B.S. acknowledges funding of the BREMEN TRAC-COFUND Fellowship Programm of Uni Bremen. G.S. and M.S. acknowledge the Central Research Development Fund of Uni Bremen. Computations done on the North-German Supercomputing Alliance (HLRN).

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Presenters

  • Malte Schueler

    • Institut für Theoretische Physik, Universität Bremen
    • Institute for theoretical Physics, University of Bremen

Authors

  • Bin Shao

    • Institute for theoretical Physics, University of Bremen

  • Malte Schueler

    • Institut für Theoretische Physik, Universität Bremen
    • Institute for theoretical Physics, University of Bremen

  • Gunnar Schönhoff

    • Institut für Theoretische Physik, Universität Bremen
    • Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen
    • Institute for Theoretical Physics, University of Bremen
    • University of Bremen
    • Institute for theoretical Physics, University of Bremen

  • Thomas Frauenheim

    • Bremen Center for Computational Materials Science, University of Bremen

  • Gerd Czycholl

    • Institute for theoretical Physics, University of Bremen

  • Tim Wehling

    • Institute for Theoretical Physics, University of Bremen
    • Institut für Theoretische Physik, Universität Bremen
    • Institute for theoretical Physics, University of Bremen