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

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.

References in corpus (7)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Two Dimensional Atomic Crystals
• Control of graphene's properties by reversible hydrogenation
• Valley polarization in MoS2 monolayers by optical pumping
• Graphane: a two-dimensional hydrocarbon
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Cited by in corpus (8)

• Exciton band structure in two-dimensional materials
• Plasmons in the van der Waals charge-density-wave material 2H-TaSe2
• Generation of multiple plasmons in strontium niobates mediated by local field effects
• MoTe2 as a natural hyperbolic material across the visible and the ultraviolet region
• First-principles method to study near-field radiative heat transfer
• Theory of intrinsic acoustic plasmons in twisted bilayer graphene
• Slow, Nanometer Light Confinement Observed in Atomically Thin TaS2
• Ab initio study of angle-resolved electron reflection spectroscopy of few-layer graphene