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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Phases and transitions in the spin-1 Bose-Hubbard model: Systematics of a mean-field theory
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Phases and transitions in the spin-1 Bose-Hubbard model: Systematics of a mean-field theory

机译:Spin-1 Bose-Hubbard模型中的相变:均场理论的系统论

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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.
机译:我们推广了无旋转Bose-Hubbard模型的平均场理论,以说明在spin-1情况下可能出现的不同类型的超流体相。特别是,我们的平均场理论可以区分极性和铁磁超流体,Mott绝缘子(在零温度下整数填充时产生)和普通Bose液体,Mott绝缘子在有限温度下向其中演化。与无旋转情况相反,我们发现在有限温度下,几个超流体-莫特绝缘子跃迁是一阶的。我们的系统研究得出了丰富的相图,其中包括一阶和二阶跃迁以及各种三临界点。我们讨论了在实验系统中实现此类相图的可能性。

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