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arXiv 0903.3944cond-mat.stat-mechcond-mat.str-el
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三维经典二聚体模型中的库仑气体跃迁

Coulomb gas transitions in three-dimensional classical dimer models

Gang Chen, Jan Gukelberger, Simon Trebst, Fabien Alet, Leon Balents

摘要:

密排,经典的二聚体模型的三维,二分晶格窝藏库仑相幂律相关在无限的温度。在这里,我们讨论了热相变的性质,这种库仑相的各种二聚体模型,大力支持晶体二聚体状态与柱状订购。对于这些模型的家庭,我们发现从库仑相的二聚体晶体的直接热转变。虽然一些系统表现出(强)的一阶跃迁对应的朗道-金兹伯格-威尔逊范式,我们也发现了明确的数字证据的连续过渡。第二个家庭的模型经历了两个连续的热转变与中间顺磁相分离的库仑相的二聚体晶体。我们可以在一个统一的候选场论框架中描述所有这些相变,其中两个复金斯堡-朗道场耦合到U(1)规范场。我们推导出的金兹伯格-朗道行动在这些领域的变量为各种二聚体模型和讨论各自的相变的影响。

英文摘要:

Close-packed, classical dimer models on three-dimensional, bipartite lattices harbor a Coulomb phase with power-law correlations at infinite temperature. Here, we discuss the nature of the thermal phase transition out of this Coulomb phase for a variety of dimer models which energetically favor crystalline dimer states with columnar ordering. For a family of these models we find a direct thermal transition from the Coulomb phase to the dimer crystal. While some systems exhibit (strong) first-order transitions in correspondence with the Landau-Ginzburg-Wilson paradigm, we also find clear numerical evidence for continuous transitions. A second family of models undergoes two consecutive thermal transitions with an intermediate paramagnetic phase separating the Coulomb phase from the dimer crystal. We can describe all of these phase transitions in one unifying framework of candidate field theories with two complex Ginzburg-Landau fields coupled to a U(1) gauge field. We derive the symmetry-mandated Ginzburg-Landau actions in these field variables for the various dimer models and discuss implications for their respective phase transitions.

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