SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Poster Session V: 2D Materials: Electronic structure, excitations, etc. I
O 66.5: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Electronic structure and charge density wave in monolayer NbS2 — •Timo Knispel1, Jeison A. Fischer1, Daniela Mohrenstecher1, Jan Berges2, Erik van Loon2, Tim Wehling2, and Thomas Michely1 — 1Institute of Physics II, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany — 2Institute of Theoretical Physics, Bremen Center for Computational Materials Science, University Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
We investigated monolayer 1H-NbS2 grown in-situ on Gr/Ir(111) by high resolution scanning tunneling microscopy and spectroscopy at temperatures down to 0.4K. The characteristic 3x3 CDW pattern is present only in the monolayer, but absent in the bilayer. We analyze the CDW gap, contrast inversion in the dI/dV maps towards both sides of the gap and the suppression of the CDW pattern in the gap. Furthermore, quasiparticle interference is observed at island edges and defects and enables us to measure the dispersion of the hole-like pocket around the Γ-point. Density of states, dispersion around the Γ-point and the properties of the CDW are compared to density functional theory calculations.
Support from the Deutsche Forschungsgemeinschaft, SFB 1238 (project number 277146847, subprojects A01 and B06) is gratefully acknowledged.