▎ 摘　　要

We investigate the plasmon dispersion relation and damping rate of a double-layer graphene system consisting of two separated monolayer graphenes with no interlayer tunneling at finite temperature We use the temperature dependent RPA dielectric function which is valid for graphene systems to obtain the plasmon frequencies and damping rates at different temperatures interlayer correlation parameters and electron densities and then compare them with those obtained from the zero temperature calculations Our results show that by increasing the temperature the plasmon frequencies decrease and the decay rate increases Furthermore we find that the behavior of a double-layer graphene system at small and large correlation parameters is different from the conventional double-layer two-dimensional electron gas system Finally we obtain that in a density imbalanced double-layer graphene system the acoustic plasmons are more affected by temperature than the equal electron densities one (C) 2010 Elsevier B V All rights reserved