SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Poster Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems
TT 23.1: Poster
Donnerstag, 30. September 2021, 13:30–16:00, P
Electronic structure and charge density wave order in monolayer NbS2 — •Timo Knispel1, Jeison A. Fischer1, Jan Berges2, Arne Schobert2, Erik van Loon2,3, Wouter Jolie1, Daniela Mohrenstecher1, Tim Wehling2, and Thomas Michely1 — 1Institute of Physics II, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany — 2Institut für Theoretische Physik, Bremen Center for Computational Materials Science and MAPEX Center for Materials and Processes, Otto-Hahn-Allee 1, University of Bremen, 28359 Bremen, Germany — 3Department of Physics, Lund University, Professorsgatan 1, 223 63, Lund, Sweden
We investigated monolayer 1H-NbS2 grown in-situ on graphene/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, CRC 1238 (project number 277146847, subprojects A01 and B06) is gratefully acknowledged.