Abstract
The dielectric response function ε ( q , ω ) has been derived in the frame t – J – V model. In addition to the acoustic plasmon modes, a new collective charge excitation mode has been found. We have shown, that in layered cuprates the inverse dielectric function 1 / ε ( q , ω ) may be negative in the area which partially overlaps the Fermi surface. Then, the interaction of quasiparticles via plasmon field causes the higher order harmonics in d x 2 - y 2 -wave symmetry of the superconducting gap driven mainly by the superexchange interaction.
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