SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster: 2D Materials II
O 36.10: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Impact of screening and relaxation on weakly coupled 2D heterostructures: implications for molecular spin-coupling — Eva Rauls1, T.T. Nhung Nguyen2, Christoph Tegenkamp2, and •Uwe Gerstmann3 — 1University of Stavanger, Norway — 2Technische Universität Chemnitz, Germany — 3Universität Paderborn, Germany
Phthalocyanines (Pc) at surfaces are prototype molecules which can host magnetic ions in a well-defined surface environment. The precise external control of individual spins, however, require a detailed knowledge of the influence of the substrate. In this combined experimental and theoretical study, we have investigated the influence of different graphene-related substrates onto the structural, electronic and magnetic properties of adsorbed Pb and Mn-phthalocyanines. Formation of almost identical densely packed PbPc molecular layers with strongly tilted molecules were found on n-type and p-type doped 2D templates. On graphite (HOPG), the dispersing molecular states of the less deformed molecular adsorbate stress the importance of substrate mediated interaction and proximity coupling [1]. After substituting Pb by magnetic Mn, the interaction with the substrate is clearly increased. On epitaxial monolayer graphene (MLG) the MnPc experience even the underlying SiC substrate, resulting in a 4×2 reconstructed molecular layer with very specific substrate mediated magnetic coupling.
[1] T.T. Nhung Nguyen, T. Sollfrank, C. Tegenkamp, E. Rauls, U. Gerstmann,
Phys. Rev. B 103, L201408 (2021).