Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: 2D Materials beyond Graphene: TMDCs, Slicene and Relatives
O 46.4: Poster
Dienstag, 8. März 2016, 18:15–20:30, Poster E
Single-Layer MoS2 on Au(111): Electronic structure — Albert Bruix1, Jill A. Miwa1, •Nadine Hauptmann2, Søren Ulstrup1, Signe G. Grønborg1, Charlotte E. Sanders1, Maciej Dendzik1, Antonija Grubišić Čabo1, Marco Bianchi1, Jeppe Vang Lauritsen1, Daniel Wegner2, Alexander A. Khajetoorians2, Bjørk Hammer1, and Philip Hofmann1 — 1Department of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark — 2Institute for Molecules and Materials, Radboud University, 6500 GL Nijmegen, The Netherlands
Single layer transition metal dichalcogenides are currently of considerable interest because they are 2D materials, like graphene, but have an inherent band gap. Their physical properties, e.g. their band gap and electronic structure, change dramatically in the single layer limit and depend on the underlying substrate. Molybdenum disulfide (MoS2) as a single layer has already been used in applications such as field effect transistors and optoelectronic devices. We investigate epitaxial single-layer MoS2 grown on Au(111) by low temperature scanning tunneling microscopy. Using scanning tunneling spectroscopy, we determine the single-particle band gap and compare it to density functional theory calculations of the electronic structure around the Fermi energy in the filled and empty states. At small energies, a low conductance regime is found while for higher energies onsets in the conductance are observed. These onsets are further compared to angle-resolved photoemission spectroscopy data from the same sample.