Electronic Structure of One-Dimensional Extended Hubbard Model
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概要
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We investigated the one-dimensional extended Hubbard model with the on-site interaction U and the nearest-neighbor interaction Vby using the numerical diagonalization method. Assuming the Luttinger liquid relations, we obtained the phase diagram of the ground state on the U-V plane. In the weak coupling region, the phase diagram agrees with the result of g-ology. On the other hand, in the strong coupling region for V≫|t|, a novel superconducting phase appears both for positive and negative U. We also investigated the charge gap and the spin gap. The results suggest that the superconducting phase extends over the Tomonaga-Luttinger region (without spin gap) and the Luther-Emery region (with spin gap).
- 社団法人日本物理学会の論文
- 1994-04-15
著者
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Ono Yoshiaki
Department Of Geriatric Dentistry Osaka Dental University
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Sano Kazuhiro
Department Of Physics Engineering Mie University
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