Quantum Monte Carlo Evidence for Superconductivity in the Three-Band Hubbard Model in Two Dimensions
Kazuhiko Kuroki, Hideo Aoki
DOI 10.1103/PhysRevLett.76.4400 · Physical Review Letters
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Abstract
A possibility of the electronic origin of the high-temperature superconductivity in cuprates is probed with the quantum Monte Carlo method by revisiting the three-band Hubbard model comprising Cu 3dx2−y2 and O 2pσ orbitals. The dx2−y2 pairing correlation is found to turn into an increasing function of the repulsion Ud within the d orbitals or the d- p level offset Δɛ, where the normalized correlation grows with the system size. We have detected this in both the charge-transfer and Mott-Hubbard regimes upon entering the strong-correlation region ( Ud or Δɛ> bare bandwidth).
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