Polaron States in a CuO Chain

K. Bieniasza and A.M. Oleśa,b aMarian Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, PL-30-059, Kraków, Poland bMax-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany

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We introduce a one-dimensional model for a CuO chain, with holes and S=1/2 spins localized in 3dx2-y2 orbitals, and pσ oxygen orbitals without holes in the ground state. We consider a single hole doped at an oxygen site and study its propagation by spin-flip processes. We develop the Green function method and treat the hole-spin coupling in the self-consistent Born approximation, similar to that successfully used to study polarons in the regular t-J model. We present an analytical solution of the problem and investigate whether the numerical integration is a good approximation to this solution.

DOI: 10.12693/APhysPolA.127.269 PACS numbers: 72.10.Di, 75.10.Pq, 75.50.Ee