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首页> 外文期刊>Physical Review, A. Atomic, molecular, and optical physics >Stochastic mean-field theory: Method and application to the disordered Bose-Hubbard model at finite temperature and speckle disorder
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Stochastic mean-field theory: Method and application to the disordered Bose-Hubbard model at finite temperature and speckle disorder

机译：随机平均场理论：在有限温度和斑点斑点下无序Bose-Hubbard模型的方法和应用

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摘要

We discuss the stochastic mean-field theory (SMFT) method, which is a new approach for describing disordered Bose systems in the thermodynamic limit including localization and dimensional effects. We explicate the method in detail and apply it to the disordered Bose-Hubbard model at finite temperature, with on-site box disorder, as well as experimentally relevant unbounded speckle disorder. We find that disorder-induced condensation and re-entrant behavior at constant filling are only possible at low temperatures, beyond the reach of current experiments [M. Pasienski, D. McKay, M. White, and B. DeMarco, e-print arXiv:0908.1182]. Including off-diagonal hopping disorder as well, we investigate its effect on the phase diagram in addition to pure on-site disorder. To make connection to present experiments on a quantitative level, we also combine SMFT with an LDA approach and obtain the condensate fraction in the presence of an external trapping potential.
机译：我们讨论了随机平均场理论（SMFT）方法，这是一种在热力学极限范围内描述无序Bose系统的新方法，包括局部化和尺寸效应。我们将详细说明该方法，并将其应用于在有限温度下的无序Bose-Hubbard模型，现场盒状无序以及实验相关的无斑点散斑。我们发现，在恒定填充条件下，无序诱发的凝结和折返行为只有在低温下才有可能，这超出了当前实验的范围[M. Pasienski，D。McKay，M。White和B. DeMarco，电子版arXiv：0908.1182]。包括非对角跳动障碍，除了纯现场障碍之外，我们还研究了其对相图的影响。为了在数量上与当前实验建立联系，我们还将SMFT与LDA方法结合使用，并在存在外部捕集势的情况下获得冷凝水馏分。

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