Hole pairing and phonon dynamics in generalized 2D $t-J-$Holstein models

Abstract

The formation of hole pairs in the planar t-J model is studied in the presence of independent {\it dynamic} vibrations of the in-plane oxygen atoms. In-plane (breathing modes) and out-of-plane (buckling modes) displacements are considered. We find strong evidences in favor of a stabilization of the two hole bound pair by out-of-plane vibrations of the in-plane oxygens. On the contrary, the breathing modes weaken the binding energy of the hole pair. These results are discussed in the context of the superconducting cuprates.

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References in corpus (5)

• Polarons and bipolarons in strongly interacting electron-phonon systems
• d_{x^2-y^2} Symmetry and the Pairing Mechanism
• A Possible Phononic Mechanism for $d_{x^2-y^2}$-Superconductivity in the Presence of Short-Range AF Correlations
• Spin-Phonon Coupling in the Single-Layer Extended t-J Model
• On the Internal Structure of the Singlet d${}_{X^2-Y^2}$ Hole Pair in an Antiferromagnet

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• Highly anisotropic anomaly in the dispersion of the copper-oxygen bond-bending phonon in superconducting YBa2Cu3O7 from inelastic neutron scattering
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• Suppression of superconductivity in the Hubbard model by buckling and breathing phonons
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