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O: Fachverband Oberflächenphysik
O 66: 2D Materials IV: Interfacial Interactions (joint session O/CPP/HL)
O 66.3: Vortrag
Mittwoch, 18. März 2020, 11:00–11:15, WIL B321
Electronic vs Structural Effects in the Moiré Pattern of MoS2 on Au(111) — Caio C. Silva1,2, Daniela Dombrowski1,2, Nicolae Atodiresei3, Wouter Jolie2, Ferdinand Farwick zum Hagen2, Jiaqi Cai2, Paul T. P. Ryan4, Pardeep Thakur5, Vasile Caciuc3, Stefan Blügel3, David A. Duncan5, Thomas Michely2, Tien-Lin Lee5, and •Carsten Busse1,2,6 — 1WWU Münster, Germany — 2Universität zu Köln, Germany — 3FZ Jülich and JARA, Germany — 4Imperial College London, U. K. — 5Diamond Light Source Ltd, U. K. — 6Universität Siegen, Germany
The lattice mismatch between a monolayer of MoS2 and its Au(111) substrate induces a moiré superstructure. The local variation of the registry between sulfur and gold atoms at the interface leads to a periodic pattern of strongly and weakly interacting regions. In consequence, also the electronic bands show a spatial variation.
We use scanning tunneling microscopy and spectroscopy (STM/STS), x-ray photoelectron spectroscopy (XPS) and x-ray standing wave (XSW) for a determination of the atomic structure and the resulting electronic properties. The experimental results are corroborated by density functional theory (DFT). We deduce the structure of the supercell with high precision, identify the fraction of interfacial atoms that are strongly interacting, and analyze the variation of the electronic structure in dependence of the location within the moiré cell and the nature of the band.