Superconducting phase of a two-chain Hubbard model
Takashi Yanagisawa, Yukihiro Shimoi, Kunihiko Yamaji
DOI 10.1103/PhysRevB.52.R3860 · Physical Review B
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Abstract
The exponent Kρ and pair-field-correlation functions are calculated for a two-chain Hubbard model with an exact numerical diagonalization method. Our calculations clearly indicate that a superconducting phase appears for a wide range of Coulomb strength, where Kρ and pair-field correlation functions are enhanced compared to the noninteracting system. The interchain pairing appears predominantly and thus our mechanism predicts an anisotropic superconductivity.
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