Doublon-Holon Binding Effects on Mott Transitions in Two-Dimensional Bose Hubbard Model

Hisatoshi Yokoyama; Masao Ogata

doi:10.1016/j.jpcs.2008.06.087

Doublon-Holon Binding Effects on Mott Transitions in Two-Dimensional Bose Hubbard Model

Strongly Correlated Electrons 2009-11-13 v1 Statistical Mechanics

Authors: Hisatoshi Yokoyama , Masao Ogata

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Abstract

A mechanism of Mott transitions in a Bose Hubbard model on a square lattice is studied, using a variational Monte Carlo method. Besides an onsite correlation factor, we introduce a four-body doublon-holon factor into the trial state, which considerably improves the variational energy and can appropriately describe a superfluid-insulator transition. Its essense consists in binding (and unbinding) of a doublon to a holon in a finite short range, identical with the cases of fermions. The features of this transition are qualitatively different from those of Brinkman-Rice-type transitions.

Keywords

mott insulator transition bose-hubbard model hubbard model

Cite

@article{arxiv.0708.2765,
  title  = {Doublon-Holon Binding Effects on Mott Transitions in Two-Dimensional Bose Hubbard Model},
  author = {Hisatoshi Yokoyama and Masao Ogata},
  journal= {arXiv preprint arXiv:0708.2765},
  year   = {2009}
}

Comments

5 pages, 6 figures, proceedings of SNS2007

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