Variational Monte-Carlo Studies of Hubbard Model.II
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概要
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As a continuation of a previous paper [J. Phys. Soc. Jpn. 56 (1987) 1490], the variational Monte-Carlo method is extended to include the antiferromagnetic long-rangeorder. The theory is based on the Gutzwiller-type correlation factor and its effect is exactly taken into account by the Monte-Carlo procedure. An application is made to thehalf-filled-band case of one-dimensional lattice (50 sites), two-dimensional square Rat-tice (up to 20 X 20 sites) and three-dimensional simple cubic lattice (6 X 6 X 6 sites).The result is qualitatively different from previous studies relying on the random-phase-type "Gutzwiller approximation." The variational energy for two and threedimensions is favorably compared with Hirsch's quantum Monte-Carlo data.
- 社団法人日本物理学会の論文
- 1987-10-15
著者
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Shiba Hiroyuki
Institute For Solid State Physics University Of Tokyo
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Yokoyama Hisatoshi
Institute For Solid State Physics University Of Tokyo
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Shiba Hiroyuki
Institute For Solic State Physics University Of Tokyo
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