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Journal Article

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


Rubio,  Angel
Nano-Bio Spectroscopy Group and ETSF Scientific Development Centre, Departamento Fısica de Materiales, Universidad del Pa´ıs Vasco UPV/EHU, Centro de F´ısica de Materiales CSIC-UPV/EHU-MPC and DIPC;
Theory, Fritz Haber Institute, Max Planck Society;

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Cudazzo, P., Gatti, M., & Rubio, A. (2013). Local-field effects on the plasmon dispersion of two-dimensional transition metal dichalcogenides. New Journal of Physics, 15(12): 125005. doi:10.1088/1367-2630/15/12/125005.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-F4EF-5
Two-dimensional (2D) transition-metal dichalcogenides (TMDs) are gaining increasing attention as an alternative to graphene for their very high potential in optoelectronics applications. Here, we consider two prototypical metallic 2D TMDs, NbSe2 and TaS2. Using a first-principles approach, we investigate the properties of the localized intraband d plasmon that cannot be modeled 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 the interband transitions and the local-field effects. This result can be exploited to tune the plasmonic properties of these novel 2D materials.