Pai, Ramesh V. ; Sheshadri, K. ; Pandit, Rahul (2008) Phases and transitions in the spin-1 Bose-Hubbard model: systematics of a mean-field theory Physical Review B: Condensed Matter & Materials Physics, 77 (1). 014503_1-014503_10. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v77/i1/e014503
Related URL: http://dx.doi.org/10.1103/PhysRevB.77.014503
Abstract
We generalize the mean-field theory for the spinless Bose-Hubbard model to account for the different types of superfluid phases that can arise in the spin-1 case. In particular, our mean-field theory can distinguish polar and ferromagnetic superfluids, Mott insulator, that arise at integer fillings at zero temperature, and normal Bose liquids into which the Mott insulators evolve at finite temperatures. We find, in contrast to the spinless case, that several of the superfluid-Mott insulator transitions are of first order at finite temperatures. Our systematic study yields rich phase diagrams that include first-order and second-order transitions and a variety of tricritical points. We discuss the possibility of realizing such phase diagrams in experimental systems.
Item Type: | Article |
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Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 33501 |
Deposited On: | 30 Mar 2011 12:37 |
Last Modified: | 17 May 2016 16:21 |
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