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

Plasmonic Physics of 2D Crystalline Materials

1
School of Nano Science, Institute for Research in Fundamental Sciences (IPM), Tehran 19395-5531, Iran
2
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

Abstract

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

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