Mechanism of superfluid-insulator transition in two-dimensional Bose Hubbard model

Hisatoshi Yokoyama, T. Miyagawa, M. Ogata

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

To understand the mechanism of Mott transitions in case of no magnetic influence, superfluid-insulator (Mott) transitions are studied for the S = 0 Bose Hubbard model on the square lattice, using a variational Monte Carlo approach. In trial many-body wave functions, we introduce various types of attractive correlation factors between a doubly-occupied site (doublon, D) and an empty site (holon, H), which play a central role for the transition. We propose an improved picture of D-H binding; a Mott transition occurs when the D-H pair length becomes equivalent to the minimum D-D distance, which lengths are appropriately estimated. We confirm this picture is valid for all the wave functions with attractive D-H factors we consider, and point out it can be universal for nonmagnetic Mott transitions.

Original languageEnglish
Pages (from-to)730-734
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume471
Issue number21-22
DOIs
Publication statusPublished - 2011 Nov 1

Keywords

  • Bose Hubbard model
  • Mott transition
  • Superfluid
  • Variation method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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