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O: Fachverband Oberflächenphysik
O 56: 2D Materials beyond Graphene
O 56.15: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-EG
Influence of the Charge Density Wave Order on Quasiparticle Excitations in 2H-NbSe2 — •Eva-Maria Liebhaber1, Olof Peters1, Michael Ruby1, Kai Rossnagel2, Benjamin W. Heinrich1, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany. — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
The transition metal dichalcogenide (TMDC) 2H-NbSe2 is a layered material with interesting properties of strongly correlated electrons at low temperatures. A superconducting phase with a critical temperature of Tc,SC ≈ 7.2 K coexists with a threefold symmetric charge density wave (CDW) with Tc,CDW ≈ 33 K. Although the material has been studied intensively for a long time, the exact interplay between superconductivity and CDW order is still under debate. Recently, Soumyanarayanan et al. observed a quantum phase transition from the familiar triangular CDW to a stripe charge order which they assigned to local strain caused by subsurface defects [1].
Here, we investigate the influence of the different CDW phases on the quasiparticle excitation spectra using low temperature scanning tunneling spectroscopy with superconducting tips. The quasiparticle spectra show variations with the periodicity of the CDW as well as on the atomic scale.
A. Soumyanarayanan et al., Proceedings of the National Academy of Sciences 110, 1623-1627 (2013).