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 Tc within the strong-coupling phonon-plasmon scheme. The plasmon pairing kernel is calculated explicitly. We demonstrate that plasmons may contribute constructively to superconductivity. The result shows that one can interpret the effect of low-energy collective modes in terms of an effective negative μ*.