Phonon mediated hole pairing in the 1D Hubbard model near half-filling

Details Phonon mediated hole pairing in the 1D Hubbard model near half-filling Phonon mediated hole pairing in the 1D Hubbard model near half-filling

1999-12-25

arxiv.org/abs/cond-mat/9912449v2

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 9 figures

Scientific paper

The Hamiltonian describing a system of strongly correlated electrons coupled to dispersionless phonons was solved numerically for a ring of 8 atoms using the density matrix renormalization group (DMRG) method. It was found that electron correlation and electron-phonon coupling compete against each other, and strong electron correlations suppress the charge-ordered insulating state. This allows extended polarons to form in the strong electron-phonon coupling regime. It is shown that in this regime two polarons may form a pair via phonon mediated charge-fluctuation interaction. Based on the results we propose a novel mechanism of hole pairing. This mechanism could be relevant to High-Tc cuprates.

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