Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: 2D Materials Beyond Graphene: Growth, Structure and Substrate Interaction (joint session O/HL)
O 14.6: Vortrag
Montag, 17. März 2025, 16:15–16:30, H11
Growth and Edge Reconstruction of 2D MnI2 on Ag(111) — •Daniel Rothhardt1,2,3, Christopher Penschke4, Hans Josef Hug1,2, Regina Hoffmann-Vogel3, and Amina Kimouche3 — 1Empa, 8600 Dübendorf, Switzerland — 2Department of Physics, University of Basel, 4056 Basel, Switzerland — 3Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany — 4Institute of Chemistry, University of Potsdam, 14476 Potsdam, Germany
The reduced dimensionality of thin transition metal dihalide films on single-crystal surfaces enables a wide array of magnetic and electronic phenomena. However, producing stoichiometric monolayer islands demands thorough control over growth parameters. In this work, we utilize scanning probe microscopy (SPM) to explore the growth of MnI2 on Ag(111) through single-crucible evaporation. The Ag(111) surface’s catalytic activity promotes dehalogenation of MnI2, resulting in a reconstructed iodine adlayer that serves as a template for the formation of truncated hexagonal MnI2 islands. These islands display alter-nating edge lengths and distinctive Kelvin potentials, as revealed by Kelvin Probe Force Microscopy (KPFM). Density Functional Theory (DFT) calculations corroborate the experimental observations, including island heights, lattice parameters, and edge formation energies for both pristine and reconstructed edges. The asymmetry in edge lengths arises from differences in formation energies, determined by the orientation (up or down) of iodine atoms at the edges, as confirmed by DFT.
Keywords: 2D Materials; Scanning Porbe Microscopy; Kelvin Probe Force Microscopy; Material Growth