Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 98: Electronic structure: Surface magnetism and spin phenomena I
O 98.3: Vortrag
Donnerstag, 15. März 2018, 15:30–15:45, MA 042
Optically and Electrically Controllable Adatom Spin-orbital Dynamics in Transition Metal Dichalcogenides — Bin Shao1,2, •Malte Schueler1,2, Gunnar Schönhoff1,2, Thomas Frauenheim2, Gerd Czycholl1, and Tim Wehling1,2 — 1Institute for theoretical Physics, University of Bremen, Bremen, Germany. — 2Bremen Center for Computational Materials Science, University of Bremen, Bremen, Germany.
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.