Phases and transitions in the spin-1 Bose-Hubbard model: Systematics of a mean-field theory

Pai, Ramesh V and Sheshadri, K and Pandit, Rahul (2008) Phases and transitions in the spin-1 Bose-Hubbard model: Systematics of a mean-field theory. In: Physical Review B: Condensed Matter and Materials Physics, 77 (1).

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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:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Keywords:	Quantum statistical theory;Multicomponent condensates;spinor condensates;Boson systems;Quantum phase transitions.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	29 Mar 2010 11:08
Last Modified:	19 Sep 2010 05:58
URI:	http://eprints.iisc.ac.in/id/eprint/26671

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