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

Takahiro Ohgoe, Takafumi Suzuki, Naoki Kawashima

Research output: Contribution to journalArticle

23 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

Fingerprint

Hubbard model
Ground state
Phase diagrams
phase diagrams
ground state
Monte Carlo method
Monte Carlo methods
approximation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ground-state phase diagram of the two-dimensional extended Bose-Hubbard model. / Ohgoe, Takahiro; Suzuki, Takafumi; Kawashima, Naoki.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 5, 054520, 27.08.2012.

Research output: Contribution to journalArticle

@article{b135ec2c79194c6a82a5144b625b0a27,
title = "Ground-state phase diagram of the two-dimensional extended Bose-Hubbard model",
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.",
author = "Takahiro Ohgoe and Takafumi Suzuki and Naoki Kawashima",
year = "2012",
month = "8",
day = "27",
doi = "10.1103/PhysRevB.86.054520",
language = "English",
volume = "86",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Institute of Physics Publising LLC",
number = "5",

}

TY - JOUR

T1 - Ground-state phase diagram of the two-dimensional extended Bose-Hubbard model

AU - Ohgoe, Takahiro

AU - Suzuki, Takafumi

AU - Kawashima, Naoki

PY - 2012/8/27

Y1 - 2012/8/27

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84865634950&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84865634950&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.86.054520

DO - 10.1103/PhysRevB.86.054520

M3 - Article

VL - 86

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 5

M1 - 054520

ER -