Quantum Monte Carlo method for pairing phenomena: Supercounterfluid of two-species Bose gases in optical lattices

Takahiro Ohgoe, Naoki Kawashima

Research output: Contribution to journalArticle

13 Citations (Scopus)

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 ab ≠ 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 ibi†aj†bj. 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 languageEnglish
Article number023622
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume83
Issue number2
DOIs
Publication statusPublished - 2011 Feb 28
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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