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  Electron-energy-loss and time-dependent density functional theory study on the plasmon dispersion in 2H-NbS2

Cudazzo, P., Müller, E., Habenicht, C., Gatti, M., Berger, H., Knupfer, M., et al. (2017). Electron-energy-loss and time-dependent density functional theory study on the plasmon dispersion in 2H-NbS2.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E83C-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-2429-7
Genre: Paper

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1603.03486.pdf (Preprint), 159KB
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2017
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https://arxiv.org/abs/1603.03486 (Preprint)
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 Creators:
Cudazzo, P.1, 2, Author
Müller, E.3, Author
Habenicht, C.3, Author
Gatti, M.1, 2, 4, Author
Berger, H.5, Author
Knupfer, M.3, Author
Rubio, A.6, 7, Author              
Huotari, S.8, Author
Affiliations:
1Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA, Université Paris-Saclay, ou_persistent22              
2European Theoretical Spectroscopy Facility (ETSF), ou_persistent22              
3IFW Dresden, ou_persistent22              
4Synchrotron SOLEIL, L’Orme des Merisiers, ou_persistent22              
5Ecole Polytechnique F ́ed ́erale de Lausanne (EPFL), Institut de Physique des Nanostructures, ou_persistent22              
6Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
7Nano-Bio Spectroscopy Group and European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco CFM CSIC-UPV/EHU-MPC DIPC, ou_persistent22              
8Department of Physics, P.O.Box 64, FI-00014 University of Helsinki, Finland, ou_persistent22              

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 Abstract: 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 \AA−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.

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Language(s): eng - English
 Dates: 2017-01-13
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1603.03486
 Degree: -

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