Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-10-11
Phys. Rev. A 77, 013609 (2008)
Physics
Condensed Matter
Statistical Mechanics
7 pages, 10 figures
Scientific paper
10.1103/PhysRevA.77.013609
We investigate the phase diagram of a two-species Bose-Hubbard model including a conversion term, by which two particles from the first species can be converted into one particle of the second species, and vice-versa. The model can be related to ultra-cold atom experiments in which a Feshbach resonance produces long-lived bound states viewed as diatomic molecules. The model is solved exactly by means of Quantum Monte Carlo simulations. We show than an "inversion of population" occurs, depending on the parameters, where the second species becomes more numerous than the first species. The model also exhibits an exotic incompressible "Super-Mott" phase where the particles from both species can flow with signs of superfluidity, but without global supercurrent. We present two phase diagrams, one in the (chemical potential, conversion) plane, the other in the (chemical potential, detuning) plane.
Denteneer Peter J. H.
Rousseau Valery G.
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