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 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 language | English |
|---|---|
| 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
Fingerprint Dive into the research topics of 'Quantum Monte Carlo method for pairing phenomena: Supercounterfluid of two-species Bose gases in optical lattices'. Together they form a unique fingerprint.
Cite this
Ohgoe, T., & Kawashima, N. (2011). Quantum Monte Carlo method for pairing phenomena: Supercounterfluid of two-species Bose gases in optical lattices. Physical Review A - Atomic, Molecular, and Optical Physics, 83(2), [023622]. https://doi.org/10.1103/PhysRevA.83.023622