Local-Ansatz Approach with Momentum Dependent Variational Parameters to Correlated Electron Systems(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
- 論文の詳細を見る
A new wavefunction which improves the Gutzwiller-type local ansatz method has been proposed to describe the correlated electron system. The ground-state energy, double occupation number, momentum distribution function, and quasiparticle weight have been calculated for the half-filled band Hubbard model in infinite dimensions. It is shown that the new wavefunction improves the local-ansatz approach (LA) proposed by Stollhoff and Fulde. Especially, calculated momentum distribution functions show a reasonable momentum dependence. The result qualitatively differs from those obtained by the LA and the Gutzwiller wavefunction. Furthermore, the present approach combined with the projection operator method CPA is shown to describe quantitatively the excitation spectra in the insulator regime as well as the critical Coulomb interactions for a gap formation in infinite dimensions.
- 社団法人日本物理学会の論文
- 2008-11-15
著者
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KAKEHASHI Yoshiro
Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus
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Yasuda Chitoshi
Department Of Physics And Earth Sciences Faculty Of Science University Of The Ryukyus
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SHIMABUKURO Takafumi
Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus
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Kakehashi Yoshiro
Department Of Physics And Earth Sciences Faculty Of Science University Of Ryukyus
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Shimabukuro Takafumi
Department Of Physics And Earth Sciences Faculty Of Science University Of The Ryukyus
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