Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-09-18
Phys. Rev. A 83, 023622 (2011)
Physics
Condensed Matter
Quantum Gases
4 pages, 4 figures
Scientific paper
We study the super-counter-fluid(SCF) states in the two-component hardcore Bose-Hubbard model on the 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 $< a^{\dagger} b > \neq 0, < a > = 0$, 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 $< a_{i} b_{i}^{\dagger} a_{j}^{\dagger} b_{j} >$. 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(KT) charactor of the SCF phase. The simulation efficiency is also improved in the SCF phase.
Kawashima Naoki
Ohgoe Takahiro
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