Third Order Perturbation Analysis of Pairing Symmetry in Two-Dimensional Hubbard Model
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概要
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We study the superconducting instabilities of singlet and triplet pairing in a two-dimensional Hubbard model on the basis of the third-order perturbation theory (TOPT). We investigate the effect of the vertex correction that is given by TOPT, comparing with the study with only the second-order effective interaction. In our results, a stable p-wave pairing state spreads from low to intermediate electron density. A d_<x^2-y^2>-wave pairing is dominant for the high density near a half-filling. It is shown that the vertex correction plays an essential role in making the p-wave pairing state dominant.
- 社団法人日本物理学会の論文
- 2002-06-15
著者
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FUKAZAWA Hirono
Department of Physics, Kyoto University
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Yamada Kosaku
Department Of Mechanical Engineering Faculty Of Engineering Kagoshima University
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Fukazawa Hirono
Department Of Physics Kyoto University
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