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HL: Fachverband Halbleiterphysik
HL 21: 2D Materials II: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)
HL 21.2: Vortrag
Montag, 16. März 2020, 15:15–15:30, WIL C107
Geometry, electronic structure, and bonding of single-domain h-BN on Pt(110) — •Marco Thaler1, Dominik Steiner1, Alexander Menzel1, Florian Mittendorfer2, and Erminald Bertel1 — 1Physikalische Chemie, Universität Innsbruck, Österreich — 2Institut für Angewandte Physik, TU Wien, Österreich
Recently we reported single-domain growth of hexagonal Boron Nitride (h-BN) on Pt(110)1. This is a peculiar system, where the substrate adapts to the h-BN adlayer by forming a (1xn) missing-row reconstruction (n = 5 or 6). The bandstructure was investigated by angle-resolved UV photoemission (ARPES) and is very similar to that of a free-standing h-BN monolayer except for the appearance of umklapp bands reflecting the periodicity of the Moiré pattern and testifying for the perfect film quality. Binding energies agree with other h-BN/transition metal systems if referenced to the vacuum level. Additionally, we studied the local density of states (LDOS) for differently positioned atoms in the h-BN film by DFT calculations. For N atoms on top of Pt atoms a small LDOS maximum appears at the Fermi level, indicating a weak covalent contribution to the h-BN-Pt bonding. This, the mean h-BN-Pt(110) distance, and the workfunction change place the present system at the borderline between purely dispersive and chemisorptive bonding2
1 Steiner, D., Mittendorfer, F., Bertel, E. ACS Nano 13, 7083-7090(2019)
2 Bokdam, M., Brocks, G., Kelly, P. J. Phys. Rev. B 90, 085415(2014)