GENERALIZED KONDO LATTICE MODEL AND ITS SPIN-POLARON REALIZATION BY THE PROJECTION METHOD FOR CUPRATES

Valkov, V. V.; Dzebisashvili, D. M.; Barabanov, A. F. THEORETICAL AND MATHEMATICAL PHYSICS, 191 (2):752-763; Doi: 10.1134/S0040577917050142 MAY 2017

The spin–fermion model, which is an effective low-energy realization of the three-band Emery model after passing to the Wannier representation for the px and py orbitals of the subsystem of oxygen ions, reduces to the generalized Kondo lattice model. A specific feature of this model is the existence of spin-correlated hoppings of the current carriers between distant cells. Numerical calculations of the spectrum of spin-electron excitations highlight the important role of the long-range spin-correlated hoppings.

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