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

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http://hdl.handle.net/10138/168528

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Cudazzo , P , Müller , E , Habenicht , C , Gatti , M , Berger , H , Knupfer , M , Rubio , A & Huotari , S 2016 , ' Negative plasmon dispersion in 2H-NbS2 beyond the charge-density-wave interpretation ' , New Journal of Physics , vol. 18 , 103050 . https://doi.org/10.1088/1367-2630/18/10/103050

Title: Negative plasmon dispersion in 2H-NbS2 beyond the charge-density-wave interpretation
Author: Cudazzo, Pierluigi; Müller, Eric; Habenicht, Carsten; Gatti, Matteo; Berger, Helmuth; Knupfer, Martin; Rubio, Angel; Huotari, Simo
Contributor: University of Helsinki, Department of Physics
Date: 2016-10-26
Language: eng
Number of pages: 7
Belongs to series: New Journal of Physics
ISSN: 1367-2630
URI: http://hdl.handle.net/10138/168528
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 angstrom(-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.
Subject: cond-mat.str-el
114 Physical sciences
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