Synergistic Polaron Formation in the Hubbard-Holstein Model at Small Doping
Abstract
We study the effect of dynamical Holstein phonons on the physics of the Hubbard model at small doping using the dynamical cluster approximation on a cluster. Non-local antiferromagnetic correlations are found to significantly enhance the electron-phonon coupling, resulting in polaron formation for moderate coupling strengths. At finite doping, the electron-phonon coupling is found to strongly enhance the non-local spin correlations, indicating a synergistic interplay between the electron-phonon coupling and antiferromagnetic correlations. Although it enhances the pairing interaction, the electron-phonon coupling is found to decrease the superconducting transition temperature, due to the reduction in the quasiparticle fraction.
Keywords
Cite
@article{arxiv.cond-mat/0607623,
title = {Synergistic Polaron Formation in the Hubbard-Holstein Model at Small Doping},
author = {Alexandru Macridin and Brian Moritz and Mark Jarrell and Thomas Maier},
journal= {arXiv preprint arXiv:cond-mat/0607623},
year = {2007}
}
Comments
accepted for publication in Phys. Rev. Lett