Polaronic approach to strongly correlated electron system with strong electron-phonon interaction

Abstract

The three band p-d model of strongly correlated electrons interacting with optical phonon via diagonal and off-diagonal electron-phonon interaction is considered within cluster perturbation theory. At first step the exact diagonalization of the Hamiltonian of CuO4 cluster results in the construction of local polaronic eigenstates |p> with hole numbers nh=0,1,2 per unit cell. The inter cluster hoppings and interactions are exactly written in terms of Hubbard operators X(pq)= |p><q| determined within the multielectron polaronic eigenstates |p>. The Fermi type single electron quasiparticle dispersion and spectral weight are calculated for the undoped antiferromagnetic parent insulator like La2CuO4. The quasiparticle dispersion of Hubbard polarons is determined by a hybridization of the several Hubbard subbands with local Franck-Condon resonances. For small electron-phonon interaction the conductivity band is stronger renormalized then the valence band. Nevertheless for large electron-phonon interaction both bands are strongly renormalized with quasiparticle localization. Effect of partial compensation of diagonal and off-diagonal electron-phonon interaction at intermediate coupling is found.

16 pages, 11 figures, 2 tables

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Cited by in corpus (7)

• Polaron transformations in the realistic model of the strongly correlated electron system
• Spectral features of polaronic excitations in a superconducting analog simulator
• One- and two-particle correlation functions in the cluster perturbation theory for cuprates
• The Holstein Polaron Problem Revisited
• Effect of short-range correlations on spectral properties of doped Mott insulators
• Phonon-assisted insulator-metal transitions in correlated systems driven by doping
• Polaron model of pseudogap state in quasi-one-dimentional systems