Abstract
The frequency-dependent conductivity (resistivity) of two isolated parallel electron layers is calculated. The authors take into account both the direct electron-electron interaction and the coupling between electrons through phonon exchange. It is found that the interlayer momentum relaxation due to the direct Coulomb interaction and the phonon exchange interaction has the same dependence on the layer separation. The results for the conductivity rests on the Kubo formula for conductivity and the Green function formalism. The numerical results for the temperature dependence of sigma 12 in the DC limit is presented. Furthermore, they have calculated the frequency dependence of sigma 12 in the zero-temperature limit.
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