Acoustic plasmons in layered systems and the phonon-plasmon mechanism of superconductivity

We address the question whether or not acoustic collective modes contribute to superconductivity in a layered electron, gas. We calculate T-c within t he strong-coupling phonon-plasmon scheme. The plasmon pairing kernel is cal culated explicitly. We demonstrate that plasmons may contribute constructiv ely to superconductivity. The result shows that one can interpret the effec t of low-energy collective modes in terms of an effective negative mu*.