## Abstract

We study the supercounterfluid (SCF) states in the two-component hard-core Bose-Hubbard model on a square lattice, using the quantum Monte Carlo method based on the worm (directed-loop) algorithm. Since the SCF state is a state of a pair condensation characterized by a^{†}b ≠ 0,a=0, and b=0, where a and b are the order parameters of the two components, it is important to study behaviors of the pair-correlation function a _{i}bi†aj†b_{j}. For this purpose, we propose a choice of the worm head for calculating the pair-correlation function. From this pair correlation, we confirm the Kosterlitz-Thouless character of the SCF phase. The simulation efficiency is also improved in the SCF phase.

Original language | English |
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Article number | 023622 |

Journal | Physical Review A - Atomic, Molecular, and Optical Physics |

Volume | 83 |

Issue number | 2 |

DOIs | |

Publication status | Published - 2011 Feb 28 |

Externally published | Yes |

## ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics