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Quantum Monte Carlo evidence for superconductivity in the three-band Hubbard model in two dimensions

Kazuhiko Kuroki·Hideo Aoki
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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$3d_{x^2-y^2}$ and O$2p_σ$ orbitals. The $d_{x^2-y^2}$ pairing correlation is found to turn into an increasing function of the repulsion $U_d$ within the $d$ orbitals or the $d$-$p$ level off-set $Δ\varepsilon$, where the correlation grows with the system size. % and is long-ranged as also seen from a real-space analysis. We have detected this in both the charge-transfer and Mott-Hubbard regimes upon entering the strong-correlation region ($U_d$ or $Δ\varepsilon >$ bare band width).

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Kazuhiko Kuroki, Hideo Aoki. 1995-12-20. Quantum Monte Carlo evidence for superconductivity in the three-band Hubbard model in two dimensions. https://doi.org/10.1103/physrevlett.76.4400

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