Dispersion anomalies induced by the low-energy plasmon in the cuprates

Abstract

We discuss the characteristic effects of the electron plasmon interaction resulting from the $\ensuremath{\sim}1\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ plasmon, which is a universal feature in the cuprates. Using the framework of a one-band tight-binding model, we identify signatures of this low-energy plasmon in the electronic structure of metallic overdoped ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8}$ as well as half-filled insulating ${\mathrm{Sr}}_{2}\mathrm{Cu}{\mathrm{O}}_{2}{\mathrm{Cl}}_{2}$. The electron-plasmon interaction is found to yield renormalizations near the Fermi energy in reasonable accord with experimental observations, and to produce dispersion anomalies at higher energies.