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Superconductivity in the One-Dimensional Two-Orbital Hubbard Model with Finite Band Splitting
Superconductivity in the One-Dimensional Two-Orbital Hubbard Model with Finite Band Splitting
Sano, K.
Ono, Y.
Using the numerical diagonalization method, we investigate superconductivity and related ferromagnetism in the one-dimensional two-orbital Hubbard model with a finite band splitting at less than half filling. We obtain a superconducting (SC) region with the Luttinger liquid parameter Kρ>1 and confirm the anomalous flux quantization in the SC state. It is found that the SC phase appears near the partially polarized ferromagnetic phase. We also calculate various pairing correlation functions to clarify the nature of the SC phase. Detailed analysis of these functions indicates that the triplet pairing between the nearest neighbour sites is relevant to the superconductivity. It suggests that ferromagnetic fluctuation plays an important role for the superconductivity.
IOP Publishing
2007-03
eng
journal article
http://hdl.handle.net/10191/26890
https://niigata-u.repo.nii.ac.jp/records/2062
info:doi/10.1088/0953-8984/19/14/145284
AA10672168
09538984
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter
19
14
145284-1
145284-6
https://niigata-u.repo.nii.ac.jp/record/2062/files/1007.pdf
application/pdf
106.3 kB
2019-07-29