1202.3054 (Arghavan Safavi-Naini et al.)

First order SF-MI transition in the Bose-Hubbard model with tunable
three-body onsite interaction    [PDF]

Arghavan Safavi-Naini, Javier von Stecher, Barbara Capogrosso-Sansone, Seth T. Rittenhouse

We study the two-dimensional Bose-Hubbard model in the presence of a 3-body
interaction term, both at a mean field level and via quantum Monte Carlo
simulations. The 3-body term is tuned by coupling the triply occupied states to
a trapped universal trimer. We find that, for sufficiently attractive 3-body
interaction the n = 2 Mott lobe disappears and the system displays first order
phase transitions separating the n = 1 from the n = 3 lobes, and the n = 1 and
n = 3 Mott insulator from the superfluid. We have also analyzed the effect of
finite temperature and found that transitions are still of first order at
temperatures T ~ J.

View original: http://arxiv.org/abs/1202.3054