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Plasmon dispersion in graphene – GaAs system at zero temparature
Tóm tắt
The dynamical dielectric function of a double-layer system made of mono – layer graphene (MLG) and GaAs quantum well with separation of and homogenous dielectric background at zero temperature is investigated. The results were used to calculate the plasmon dispersion modes and damping rate of the structure and compare to those of similar double layer systems. Calculations are done within random – phase – approximation (RPA) and taking into account the layer-thickness of two – dimensional – electron gas (2DEG). In addition, the analytical expressions of plasmon frequencies are found out by using approximation expansion with the first order of response and Coulomb bare interaction functions. The results show that the plasmon modes and damping rate of the structure depend considerably on separation, 2DEG layer-thickness, the dielectric constant of contacting media, and carrier densities. However, the dependence of two branches in plasmon on these properties is not similar.
Từ khóa: Damping rate, dynamical dielectric function, plasmon dispersion modes, random – phase – approximation
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