Plasmon-lq-f~on~n Coupling Effects on the Drag Rate in Double Qua~um-will Systems
نویسندگان
چکیده
We study the Coulomb drag rate for electrons in a double-quantumwell st~ct~e taking into account the el~tron-optimal phon~n interactions. The full wave vector and frequency dependent random-phase approximation (RPA) at finite temperature is employed to describe the effective interlayer Coulomb interaction. The electron-electron and electron-optical phonon couplings are treated on an equal footing. The electron-phonon mediated interaction contribution is investigated for different layer separations and layer densities. We find that the drag rate at high tem~ratures (i.e., T 2 0.3 EF) is dominated by the coupled plasmon-phonon of the system. Including the local-meld efIects in an approximate way we estimate the important of intralayer correlations to be si~i~cant. @ 1997 Elsevier Science Ltd
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