Phase Transitions of Bosons in Optical Lattices with a Mixture of Single and Pair Hoppings
V.M. Travin and T.K. Kopeć
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O.B. 1410, 50-950 Wrocław, Poland
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We considered Bose condensate in optical lattice with mixture of single and pair hoppings for arbitrary temperatures. In order to calculate free energy of the system and determine phase transition lines between disordered and ordered phases, the Laplace transform: method has been applied. We identified several possible scenarios for phase diagrams with phase transitions of the second kind. The results have been obtained from both analytical and numerical methods of calculation. Finally, we obtained thermal insensitivity of the system for big values of reduced pair hopping and (or) reduced chemical potential.

DOI: 10.12693/APhysPolA.130.625
PACS numbers: 67.10.Fj, 67.85.Hj, 67.90.+z