Ground-state phase diagram of the two-dimensional extended Bose-Hubbard model

Takahiro Ohgoe, Takafumi Suzuki, Naoki Kawashima

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We investigate the ground-state phase diagram of the soft-core Bose-Hubbard model with the nearest-neighbor repulsion on a square lattice by using an unbiased quantum Monte Carlo method. In contrast to a previous study, we present the ground-state phase diagrams up to high hopping amplitudes. As a result, in addition to the known supersolid above half-filling, we find a supersolid phase below and at half-filling for high hopping amplitudes. In addition, for a strong nearest-neighbor repulsion, we show that the supersolid phase occupies a remarkably broad region in the phase diagram. These results are in agreement with the results of the Gutzwiller mean-field approximation. However, it turns out that the regions of the supersolid phases are significantly smaller than the mean-field results.

Original languageEnglish
Article number054520
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number5
DOIs
Publication statusPublished - 2012 Aug 27
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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