Strong enhancement of d-wave superconducting state in the three-band Hubbard model coupled to an apical oxygen phonon

Abstract

We study the hole binding energy and pairing correlations in the three-band Hubbard model coupled to an apical oxygen phonon, by exact diagonalization and constrained-path Monte Carlo simulations. In the physically relevant charge-transfer regime, we find that the hole binding energy is strongly enhanced by the electron-phonon interaction, which is due to a novel potential-energy-driven pairing mechanism involving reduction of both electronic potential energy and phonon related energy. The enhancement of hole binding energy, in combination with a phonon-induced increase of quasiparticle weight, leads to a dramatic enhancement of the long-range part of d-wave pairing correlations. Our results indicate that the apical oxygen phonon plays a significant role in the superconductivity of high-$T_c$ cuprates.

arXiv comment5 pages, 5 figures

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• Nonequilibrium propagation and decay of a bound pair in driven t-J models
• Orbital-selective Mott phases of a one-dimensional three-orbital Hubbard model studied using computational techniques
• Resonating Valence Bond States in an Electron-Phonon System