Synergistic Polaron Formation in the Hubbard-Holstein Model at Small Doping

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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 $2\times2$ 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.
accepted for publication in Phys. Rev. Lett

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/113485

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0607623
 http://arxiv.org/abs/cond-mat/0607623
 Phys. Rev. Lett. 97, 056402 (2006)
 doi:10.1103/PhysRevLett.97.056402

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arXiv