Variational Monte-Carlo Studies of Hubbard Model. III. Intersite Correlation Effects

Hisatoshi Yokoyama; Hiroyuki Shiba

doi:10.1143/JPSJ.59.3669

Variational Monte-Carlo Studies of Hubbard Model. III. Intersite Correlation Effects

Hisatoshi Yokoyama, Hiroyuki Shiba

Research output: Contribution to journal › Article › peer-review

116 Citations (Scopus)

Abstract

New variational wave functions are introduced to describe the Hubbard model in strong correlation. Intersite correlation (or Jastrow) factors are taken into account beyond the Gutzwiller wave function (GF). A study is made on the one-dimensional lattice and the two-dimensional square lattice at half-filling as well as less-than-half-filling. Much improvement can be achieved thereby in the description of physical quantities such as the momentum distribution and spin and charge density correlation functions. In addition, the ground state energy is lowered appreciably compared with the GF. In this connection, the Mott-Hubbard-type metal-insulator transition is also re-examined.

Original language	English
Pages (from-to)	3669-3686
Number of pages	18
Journal	journal of the physical society of japan
Volume	59
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.59.3669
Publication status	Published - 1990 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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AB - New variational wave functions are introduced to describe the Hubbard model in strong correlation. Intersite correlation (or Jastrow) factors are taken into account beyond the Gutzwiller wave function (GF). A study is made on the one-dimensional lattice and the two-dimensional square lattice at half-filling as well as less-than-half-filling. Much improvement can be achieved thereby in the description of physical quantities such as the momentum distribution and spin and charge density correlation functions. In addition, the ground state energy is lowered appreciably compared with the GF. In this connection, the Mott-Hubbard-type metal-insulator transition is also re-examined.

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Variational Monte-Carlo Studies of Hubbard Model. III. Intersite Correlation Effects

Abstract

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