Abstract
We treat a model with orbitals on the copper and oxygen sites and hopping between them. In the limit of infinite U on the Cu site, the problem is treated using the slave boson method. In the presence of doping, we find a Fermi liquid solution with mass enhancement proportional to x −1. Low frequency optical absorption shows deviation from a simple Drude behavior, with oscillator strength proportional to x. Interactions between quasi-particles via the exchange of slave bosons is calculated. The Heisenberg exchange interaction J arises as a second order boson exchange and may give rise to singlet pairing between quasi-particles. Our treatment is essentially a perturbation theory valid when J is less than the renormalized bandwidth. Consequently the Fermi liquid description may break down for small doping.
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