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Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 91: 2D materials beyond graphene: TMDCs, silicene and relatives III

O 91.2: Vortrag

Donnerstag, 15. März 2018, 10:45–11:00, MA 043

Structural vs Electronic Effects in the Moiré Pattern of MoS2 on Au(111) — •Daniela Dombrowski1,2, Caio Silva1, Nicolae Atodiresei3, Wouter Jolie1,2, Ferdinand Farwick zum Hagen2, Pardeep Thakur4, Vasile Caciuc3, Thomas Michely2, Stefan Blügel3, Tien-Lin Lee4, and Carsten Busse1,2,51Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Germany — 2II. Physikalisches Institut, Universität zu Köln, Germany — 3Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Germany — 4Diamond Light Source, United Kingdom — 5Department Physik, Universität Siegen, Germany

Scanning tunneling microscopy (STM) measurements of molybdenum disulfide (MoS2) grown on Au(111) show a strong corrugation of the moiré pattern, arising from the lattice mismatch between the MoS2 layer and the underlying gold substrate. However, STM measurements do not give a pure structural information, since the tip follows the contour of a constant density of states. We combine low temperature scanning tunneling spectroscopy (STS) and x-ray standing wave (XSW) measurements with density functional theory calculations (DFT) to separate structural and electronic contributions to the moiré modulation. Our XSW measurements indicate that MoS2 on gold is nearly flat in agreement with DFT calculations, giving a corrugation of 0.3 Å. In STS measurements we observe a significant shift of the valence band edge, following the moiré periodicity. This suggests that the observed corrugation in STM has mainly an electronic nature.

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