Variational Monte Carlo Indications of d-Wave Superconductivity in the Two-Dimensional Hubbard Model
1997 年 66 巻 2 号 p. 294-297
詳細
1997 年 66 巻 2 号 p. 294-297
The possibility of superconductivity in the ground state of thetwo-dimensional Hubbard model was investigated by means of thevariational Monte Carlo method. With slight hole doping on the 6 × 6 and 10 × 10 lattices, a clear minimum was obtained onthe curve of the total energy versus the amplitude of the d-wave gapfunction for large on-site Coulomb energies. Superconducting paircorrelations were observed to be well developed. The-next-nearest-neighbor transfer was found to appreciably affect theminimum depth.
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