Local-field effects on the plasmon dispersion of two-dimensional transition metal dichalcogenides

Pierluigi Cudazzo; Matteo Gatti; Angel Rubio

Local-field effects on the plasmon dispersion of two-dimensional transition metal dichalcogenides

Pierluigi Cudazzo ^{1, 2} Matteo Gatti ^{2, 3, 4} Angel Rubio ^{1, 2, 5}

1 Nano-Bio Spectroscopy Group

2 ETSF - European Theoretical Spectroscopy Facility

3 LSI - Laboratoire des Solides Irradiés

4 SSOLEIL - Synchrotron SOLEIL

5 FHI - Fritz-Haber-Institut der Max-Planck-Gesellschaft

Abstract : Two-dimensional transition-metal dichalcogenides (TMDs) are gaining increasing attention as alternative to graphene for their very high potential in optoelectronics applications. Here we consider two prototypical metallic 2D TMDs, NbSe$_2$ and TaS$_2$. Using a first-principles approach, we investigate the properties of the localised intraband $d$ plasmon that cannot be modelled on the basis of the homogeneous electron gas. Finally, we discuss the effects of the reduced dimensionality on the plasmon dispersion through the interplay between interband transitions and local-field effects. This result can be exploited to tune the plasmonic properties of these novel 2D materials.

Document type :

Journal articles

Domain :

Physics [physics] / Condensed Matter [cond-mat] / Materials Science [cond-mat.mtrl-sci]

Complete list of metadatas

https://hal-polytechnique.archives-ouvertes.fr/hal-00931233
Contributor : Gaëlle Bruant <>
Submitted on : Wednesday, January 15, 2014 - 10:27:45 AM
Last modification on : Wednesday, March 27, 2019 - 4:26:01 PM

Local-field effects on the plasmon dispersion of two-dimensional transition metal dichalcogenides

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Local-field effects on the plasmon dispersion of two-dimensional transition metal dichalcogenides

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