Plasmonic Physics of 2D Crystalline Materials

Applied Sciences

Zahra Torbatian¹  Reza Asgari¹ 

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

关键词: collective modes;    density functional theory;    random phase approximation;    dielectric function;   

DOI  :  10.3390/app8020238

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown