Magnetic and lattice polaron in Holstein-t-J model

Details Magnetic and lattice polaron in Holstein-t-J model Magnetic and lattice polaron in Holstein-t-J model

2002-01-14

arxiv.org/abs/cond-mat/0201220v2

Physics

Condensed Matter

Strongly Correlated Electrons

revtex, 8 eps figures included NEW version. Appendix with a full proof included

Scientific paper

10.1103/PhysRevB.66.165102

We investigate the interplay between the formation of lattice and magnetic polaron in the case of a single hole in the antiferromagnetic background. We present an exact analytical solution of the Holstein-t-J model in infinite dimensions. Ground state energy, electron-lattice correlation function, spin bag dimension as well as spectral properties are calculated. The magnetic and hole-lattice correlations sustain each other, i.e. the presence of antiferromagnetic correlations favors the formation of the lattice polaron at lower value of the electron-phonon coupling while the polaronic effect contributes to reduce the number of spin defects in the antiferromagnetic background. The crossover towards a spin-lattice small polaron region of the phase diagram becomes a discontinuous transition in the adiabatic limit.

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