Phase diagram and multicritical behaviors of mixtures of three-dimensional bosonic gases

被引：12

作者：

Ceccarelli, Giacomo ^{[1
,2
]}

Nespolo, Jacopo ^{[1
,2
,3
,4
]}

Pelissetto, Andrea ^{[5
,6
]}

Vicari, Ettore ^{[1
,2
]}

机构：

[1] Univ Pisa, Dipartimento Fis, Largo Pontecorvo 3, I-56127 Pisa, Italy

[2] Ist Nazl Fis Nucl, Largo Pontecorvo 3, I-56127 Pisa, Italy

[3] Univ Munich, Dept Phys, Arnold Sommerfeld Ctr Theoret Phys, Theresienstr 37, D-80333 Munich, Germany

[4] Univ Munich, Ctr Nanosci, Theresienstr 37, D-80333 Munich, Germany

[5] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[6] Ist Nazl Fis Nucl, Sez Roma 1, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW A | 2016年 / 93卷 / 03期

基金：

欧洲研究理事会;

关键词：

RENORMALIZATION-GROUP ANALYSIS; BOSE; SYMMETRY; DYNAMICS; LATTICE;

D O I：

10.1103/PhysRevA.93.033647

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：15

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