Magnetic and lattice polaron in Holstein-t-J model
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0201220,
title = {Magnetic and lattice polaron in Holstein-t-J model},
author = {E. Cappelluti and S. Ciuchi},
journal= {arXiv preprint arXiv:cond-mat/0201220},
year = {2009}
}
Comments
revtex, 8 eps figures included NEW version. Appendix with a full proof included