Electron Correlation in the Hubbard Model in d=∞ Dimension
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概要
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The Hubbard model with strong correlation is examined. The mean-field approximation (MFA) based on the best single-site approximation (SSA) is rigorous in thelimit of high dimension of d = -l- cX). The best SSA is reduced to solving the Andersonmodel. The ground state is a heavy-electron liquid, presumably superconducting, inthe weak-coupling regime, which is approximately defined by g : J (2) /4T.< 1 withJ(Q) being the maximum value of exchange interactions and T, the Kondo tempera-ture to show the energy scale of heavy electrons. In the strong-coupling regime de-fined by g >1, on the other hand, the ground state is a MFA-type antiferromagneticstate.
- 社団法人日本物理学会の論文
- 1991-10-15
著者
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J. Ohkawa
Department Of Physias Hokkaido University
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Ohkawa Fusayoshi
Department Of Physics Faculty Of Science University Of Tokyo
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