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

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

2012-02-14

arxiv.org/abs/1202.3054v2

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures

Scientific paper

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.

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