PLASMON PROPERTIES IN 3 - LAYER GRAPHENE SYSTEMS AT ZERO TEMPERATURE
DOI:
https://doi.org/10.51453/2354-1431/2021/515Keywords:
inhomogeneous background dielectric; damping rate; plasmon excitations; three-layer graphene system.Abstract
Plasmon excitation is one of the important properties of a material and is applied in lots of technological fields. Plasmon excitations in graphene and graphene-based structures have been studied intensively in recent years. This paper uses a random-phase approximation to calculate plasmon excitations in a three-layer graphene system (consisting of a monolayer and a bilayer graphene sheet) at zero temperature. Calculations demonstrate the existence of three undamped plasmon modes in long-wavelength regions, but their damping rates differ significantly from each other in short-wavelength areas. The increase in separation leads to different changes in the frequency of collective modes. In addition, inhomogeneous background dielectric and the decrease in carrier density in bilayer graphene affect strongly plasmon frequencies.
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