Phase separation in the bosonic Hubbard model with ring exchange
arXiv:cond-mat/0312018 · doi:10.1103/PhysRevLett.93.110404
Abstract
We show that soft core bosons in two dimensions with a ring exchange term exhibit a tendency for phase separation. This observation suggests that the thermodynamic stability of normal bose liquid phases driven by ring exchange should be carefully examined.
4 pages, 6 figures