Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Poster Spins on Surfaces at the Atomic Scale
O 45.2: Poster
Tuesday, March 18, 2025, 18:00–20:00, P2
Magnetic adatom manipulation on monolayer transition metal dichalcogenides — •Daniel Jansen1, Katharina Offermann1, Tfyeche Tounsi1, Affan Safeer1, Jeison Fischer1, Arkady Krasheninnikov2, Nicolae Atodiresei3, Thomas Michely1, Hannu-Pekka Komsa4, and Wouter Jolie1 — 1II. Physikalisches Institut, Universität zu Köln, Köln, Germany — 2Institut für Ionenstrahlphysik und Materialforschung, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 3Peter Grünberg Institut, Forschungszentrum Jülich, Jülich, Germany — 4Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
Two-dimensional materials are found to host a large variety of correlated phases. A promising approach towards understanding and controlling these phases is by means of atomic manipulation.
Here we compare two systems for atomic manipulation experiments: Fe on 1H-MoS2 and Fe on 1H-TaS2. We find that manipulation of Fe on 1H-MoS2 results in point defects (sulfur vacancies) [1], which we investigate using scanning tunneling microscopy and spectroscopy. In contrast, we find that single Fe adatoms can be laterally moved on 1H-TaS2, enabling construction of lattices consisting of tens of adatoms. We additionally report on the observation of two inequivalent adsorption sites for Fe, hollow and Ta-top sites, which manifest as differences in the adatom’s apparent height.
[1] Jansen et al., Phys. Rev. B, 109, 195430, 2024
Keywords: 2D materials; atomic manipulation; single atoms; scanning tunneling microscopy; scanning tunneling spectroscopy