Phase diagram and multicritical behaviors of mixtures of three-dimensional bosonic gases
Phase diagram and multicritical behaviors of mixtures of three-dimensional bosonic gases
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三维玻色子气体混合物的相图和多临界行为
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
E. Vicari
中科院分区：
文献类型：
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作者：
G. Ceccarelli;J. Nespolo;A. Pelissetto;E. Vicari
我们研究了玻色-爱因斯坦凝聚（BEC）模式，即具有密度-密度相互作用的玻色气体的三维混合物的临界和多临界行为，其特征在于整体U（1）圆加U（1）对称性[每个物种一个U（1）变换]。特别是，我们考虑三维玻色-哈伯德模型的两个晶格玻色气体耦合的现场种间密度-密度相互作用。我们研究了一个或两个物种的BEC的相图和沿着转变线的临界行为。我们提出了平均场计算和量子蒙特卡罗数据的有限尺寸标度分析。我们还调查的性质的多临界点的BEC过渡线的两个物种满足。相应的普适类是从相应的多临界U（1）圈加上U（1）Landau-Ginzburg-Wilson Phi（4）理论的重整化群分析中推导出来的。我们发现两个不同的关键行为，与双临界点和四临界点，分别取决于种间和种内相互作用的相对强度。
We investigate the Bose-Einstein condensation (BEC) patterns, the critical and multicritical behaviors of three-dimensional mixtures of bosonic gases with density-density interactions, characterized by a global U(1)circle plus U(1) symmetry [one U(1) transformation for each species]. In particular, we consider the three-dimensional Bose-Hubbard model for two lattice bosonic gases coupled by an on-site interspecies density-density interaction. We study the phase diagram and the critical behaviors along the transition lines of the BEC of one or both species. We present mean-field calculations and finite-size scaling analyses of quantum Monte Carlo data. We also investigate the nature of the multicritical points where the BEC transition lines of the two species meet. The corresponding universality classes are inferred from a renormalization-group analysis of the corresponding multicritical U(1)circle plus U(1) Landau-Ginzburg-Wilson Phi(4) theory. We find two distinct critical behaviors, associated with bicritical and tetracritical points, respectively, depending on the relative strength of the interspecies and intraspecies interactions.
影响因子：
19.6
作者：
Soltan-Panahi, Parvis;Luehmann, Dirk-Soeren;Sengstock, Klaus
通讯作者：
Sengstock, Klaus