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

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.023622· OSTI ID:21537209

Ohgoe, Takahiro; Kawashima, Naoki ^[1]

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1. Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581 (Japan)

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{sup {dagger}b}>{ne}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{sub i}b{sub i}{sup {dagger}a}{sub j}{sup {dagger}b}{sub 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.

• OSTI ID: 21537209
• Journal Information: Physical Review. A, Vol. 83, Issue 2; Other Information: DOI: 10.1103/PhysRevA.83.023622; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ALGORITHMS
BOSE-EINSTEIN GAS
CORRELATION FUNCTIONS
CORRELATIONS
CRYSTAL LATTICES
EFFICIENCY
HUBBARD MODEL
MONTE CARLO METHOD
ORDER PARAMETERS
PAIRING INTERACTIONS
SUPERFLUID MODEL
TETRAGONAL LATTICES
CALCULATION METHODS
CRYSTAL MODELS
CRYSTAL STRUCTURE
DIMENSIONLESS NUMBERS
FUNCTIONS
INTERACTIONS
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
NUCLEAR MODELS