Superfluidity and solid order in a two-component Bose gas with dipolar interactions in an optical lattice

Yoshihito Kuno, Keita Suzuki, and Ikuo Ichinose
Phys. Rev. A 90, 063620 – Published 11 December 2014

Abstract

In this paper, we study an extended bosonic t-J model in an optical lattice, which describes two-component hard-core bosons with nearest-neighbor pseudospin interactions and, also, inter- and intraspecies dipole-dipole interactions. In particular, we focus on the case in which two-component hard-core bosons have antiparallel polarized dipoles with each other. The global phase diagram is studied by means of the Gutzwiller variational method and also quantum Monte Carlo (QMC) simulations. Both calculations show that a striped solid order, besides a checkerboard one, appears as a result of the dipole-dipole interactions. By QMC, we find that two kinds of supersolids (SSs) form, i.e., checkerboard SS and striped SS, and we also verify the existence of an exotic phase between the striped solid and the checkerboard SS. Finally, by QMC, we study the t-J-like model, which was recently realized experimentally by A. de Paz et al. [Phys. Rev. Lett. 111, 185305 (2013)].

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  • Received 10 October 2014

DOI:https://doi.org/10.1103/PhysRevA.90.063620

©2014 American Physical Society

Authors & Affiliations

Yoshihito Kuno, Keita Suzuki, and Ikuo Ichinose*

  • Department of Applied Physics, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan

  • *ikuo@nitech.ac.jp

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Issue

Vol. 90, Iss. 6 — December 2014

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