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Appl. Sci. 2018, 8(2), 238; doi:10.3390/app8020238

Plasmonic Physics of 2D Crystalline Materials

School of Nano Science, Institute for Research in Fundamental Sciences (IPM), Tehran 19395-5531, Iran
School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran 19395-5531, Iran
Author to whom correspondence should be addressed.
Received: 5 December 2017 / Revised: 24 January 2018 / Accepted: 29 January 2018 / Published: 4 February 2018


Collective modes of doped two-dimensional crystalline materials, namely graphene, MoS 2 and phosphorene, both monolayer and bilayer structures, are explored using the density functional theory simulations together with the random phase approximation. The many-body dielectric functions of the materials are calculated using an ab initio based model involving material-realistic physical properties. Having calculated the electron energy-loss, we calculate the collective modes of each material considering the in-phase and out-of-phase modes for bilayer structures. Furthermore, owing to many band structures and intreband transitions, we also find high-energy excitations in the systems. We explain that the material-specific dielectric function considering the polarizability of the crystalline material such as MoS 2 are needed to obtain realistic plasmon dispersions. For each material studied here, we find different collective modes and describe their physical origins. View Full-Text
Keywords: collective modes; density functional theory; random phase approximation; dielectric function collective modes; density functional theory; random phase approximation; dielectric function

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Torbatian, Z.; Asgari, R. Plasmonic Physics of 2D Crystalline Materials. Appl. Sci. 2018, 8, 238.

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