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摘要翻译：
我们推广了无自旋玻色-哈伯德模型的平均场理论，以解释自旋-1情况下可能出现的不同类型的超流相。特别地，我们的平均场理论可以区分极性超流体和铁磁超流体，零温度下在整数填充中产生的莫特绝缘体，以及有限温度下莫特绝缘体演化成的正常玻色液体。我们发现，与无自旋情况相反，在有限温度下，几个超流-莫特绝缘体跃迁是一级跃迁。我们的系统研究得到了丰富的相图，包括一阶和二阶跃迁，以及各种三相点。我们讨论了在实验系统中实现这种相图的可能性。
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英文标题：
《Phases and Transitions in the Spin-1 Bose-Hubbard Model: Systematics of
a Mean-field Theory》
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作者：
Ramesh V. Pai, K. Sheshadri and Rahul Pandit
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最新提交年份：
2007
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分类信息：
一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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一级分类：Physics 物理学
二级分类：Other Condensed Matter 其他凝聚态物质
分类描述：Work in condensed matter that does not fit into the other cond-mat classifications
在不适合其他cond-mat分类的凝聚态物质中工作
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英文摘要：
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 insulators which 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 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.
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PDF链接：
https://arxiv.org/pdf/705.208
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