Quantum phases of hard-core bosons on two-dimensional lattices with anisotropic dipole-dipole interaction

Takahiro Ohgoe, Takafumi Suzuki, Naoki Kawashima

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

By using an unbiased quantum Monte Carlo method, we investigate the hard-core Bose-Hubbard model on a square lattice with the anisotropic dipole-dipole interaction. To study the effect of the anisotropy, dipole moments are assumed to be polarized in the y direction on the two-dimensional xy plane. To perform efficient simulations of long-range interacting systems, we use the worm algorithm with an O(N) Monte Carlo method. We obtain the ground-state phase diagram that includes a superfluid phase and a striped solid phase at half-filling as two main phases. In addition to these two main phases, we find a small region where there are multiple plateaus in the particle density for small hopping amplitudes. In this region, the number of plateaus increases as the system size increases. This indicates the appearance of numerous competing ground states due to frustrated interactions. In our simulations, we find no evidence of a supersolid phase.

Original languageEnglish
Article number063635
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume86
Issue number6
DOIs
Publication statusPublished - 2012 Dec 26
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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