SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Spins on Surfaces at the Atomic Scale III
O 33.8: Vortrag
Dienstag, 28. März 2023, 12:30–12:45, REC C 213
Moiré - induced renormalization of singlet-triplet excitations in antiferromagnetically coupled Mn atoms on MoS2/Au(111) — •Sergey Trishin1, Christian Lotze1, Friedemann Lohss1, Giada Franceschi1, Leonid I. Glazman2, Felix von Oppen3, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany — 2Department of Physics, Yale University, New Haven, Connecticut 06520, USA — 3Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
The properties of single magnetic atoms can change drastically upon adsorption on a surface, for example due to Kondo-like exchange coupling. The magnitude of these interactions can be tuned by a moiré patterned surface [1]. Here, we investigate single Mn atoms and dimers on single-layer molybdenum disulfide grown on a Au(111) substrate. The resulting moiré structure enables variations of the Kondo exchange coupling strength. By additionally varying the spacing between single atoms, we can investigate their properties in the direct and indirect exchange coupling regime. We find that at sufficiently close spacings, the Mn atoms form a non-magnetic singlet ground state. However, the singlet-triplet excitation energies vary strongly depending on the dimer location on the moiré structure. We ascribe these variations to a renormalization of the anti-ferromagentic exchange coupling strength.
[1] S. Trishin and C. Lotze and N. Bogdanoff and F. von Oppen and K.J. Franken, Phys. Rev. Lett. 127, 236801 (2021)