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Negative plasmon dispersion in 2H-NbS2 beyond the charge-density-wave interpretation

MPG-Autoren
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Rubio,  Angel
Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Nano-Bio Spectroscopy Group and European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco CFM CSIC-UPV/EHU-MPC DIPC, 20018 San Sebastián, Spain;

Volltexte (frei zugänglich)

1603.03486.pdf
(Preprint), 151KB

njp_18_10_103050.pdf
(Verlagsversion), 602KB

Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

Cudazzo, P., Müller, E., Habenicht, C., Gatti, M., Berger, H., Knupfer, M., et al. (2016). Negative plasmon dispersion in 2H-NbS2 beyond the charge-density-wave interpretation. New Journal of Physics, 18(10): 103050. doi:10.1088/1367-2630/18/10/103050.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002A-173A-6
Zusammenfassung
We examine the experimental and theoretical electron-energy loss spectra in 2H--Cu0.2NbS2 and find that the 1 eV plasmon in this material does not exhibit the regular positive quadratic plasmon dispersion that would be expected for a normal broad-parabolic-band system. Instead we find a nearly non-dispersing plasmon in the momentum-transfer range q < 0.35 Å-1. We argue that for a stoichiometric pure 2H-NbS2 the dispersion relation is expected to have a negative slope as is the case for other transition-metal dichalcogenides. The presence of Cu impurities, required to stabilize the crystal growth, tends to shift the negative plasmon dispersion into a positive one, but the doping level in the current system is small enough to result in a nearly-non-dispersing plasmon. We conclude that a negative-slope plasmon dispersion is not connected with the existence of a charge-density-wave order in transition metal dichalcogenides.