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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: Poster Tuesday: 2D Materials

O 39.5: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Moiré structure of MoS2 on Au(111): Local structural and electronic propertiesNils Krane, •Christian Lotze, and Katharina J. Franke — Freie Universtät Berlin, Berlin, Germany

Single-layer molybdenum disulfide (MoS2) has been of large interest in the latest years, due to features like a direct band gap, a strong spin-splitting of the valence band at the K-point or as a decoupling layer for molecules in an STM junction [1].

Here we grow MoS2 epitaxially on a Au(111) surface and investigate its local structural and electronic properties. Using a combined STM/AFM at low temperatures we can identify the two different hollow sites in the Moiré superstructure and thus the orientations of the MoS2 islands. Consequently we find a unique stacking order of MoS2 with respect to the first two layers of the Au(111) surface [2].

Furthermore we get an insight into the band structure of MoS2 with an STM [3] by measuring the decay length κ of the tunneling current, which depends on k. We find a strong spatial dependence of κ, which we ascribe to the Moiré reconstruction of MoS2 on Au(111). Additionally we find 0.4 eV above the conduction band minimum an MoS2 state at the Γ point. We ascribe its existence to the interaction between the Au(111) substrate and the MoS2.

Krane, et al., ACS Nano, 2018, 12, 11, 11698-11703
Krane, et al., Surface Science, 2018, 678, 136-142
Zhang, et al., Nano Lett., 2015, 15, 10, 6494-6500

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