Abstract
Plasmon pole approximations to the screened interaction for electrons in double-layered 2D electron gas and infinite layered electron gas systems are described and are used to calculate the effective mass and correlation energy for quasiparticles in such systems via the self-energy. Both symmetric and asymmetric double-layer systems, with different electron densities in each layer, are considered. The effective mass shows interesting behaviour as a function of layer separation and areal electron density and some qualitative differences between results for the two-layer and infinite layered electron gas systems are pointed out. Quasiparticle lifetimes to plasmon emission are also calculated for these layered structures within the random-phase approximation. Acoustic plasmons are seen to provide a low-energy loss mechanism for small interlayer separations.
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