Raman scattering from plasma excitations in a conducting double layer

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Abstract
We have investigated the Raman-scattering amplitude from processes in which the radiation field excites longitudinal collective modes in a system comprised of two parallel quasi-two-dimensional conducting electronic layers embedded in a dielectric medium. Within the random-phase approximation we have derived explicit formulas for the density response and the Raman intensity as a function of the exchanged frequency. The Raman spectrum consists of two resonance peaks corresponding to the optical- and acoustic-plasmon branches which are peculiar to this system. Both the position and the width of the resonances have been studied and are shown to depend on the electronic elastic lifetime.