Dimensionality Effects on the Charge Gap in the Dimerized Hubbard Model at Quarter Filling: the Density-Matrix and Perturbative Renormalization-Group Approaches : Condensed Matter: Electronic Properties, etc.
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概要
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We study dimensionality effects on the charge gap in the dimerized Hubbard model at quarter filling, with two approaches. First, we examine three chains coupled via the interchain one-particle hopping integral t_b, by the density-matrix renormalization-group (DMRG) method. Next, we consider the d = 1 +εdimensional model, using the perturbative renormalization-group (PRG) method. The dimensionality is controlled through t_b andε, respectively. Both approaches lead to the conclusion that, for a finite dimerization ratio, the charge gap decreases as the dimensionality increases.
- 社団法人日本物理学会の論文
- 2000-07-15
著者
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Yonemitsu Kenji
Inst. Molecular Sci. Aichi
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YONEMITSU Kenji
Department of Physics,University of Tokyo
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KISHlNE Jun-ichiro
Department of Theoretical Studies, Institute for Molecular Science
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Yonemitsu Kenji
Department Of Physics University Of Tokyo
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Kishine Jun-ichiro
Deparment Of Theoretical Studies Institute For Molecular Science
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YONEMITSU Kenji
Theoretical Division, Los Alamos National Laboratory
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