摘要翻译：
用变分蒙特卡罗方法研究了正方形格子上玻色哈伯德模型中Mott跃迁的机制。在试验态中除了引入一个现场关联因子外，我们还引入了一个四体doublon-holon因子，大大提高了变分能，并能很好地描述超流-绝缘体跃迁。它的本质在于在有限的短范围内使一个双能子与一个荷能子结合（或解结合），这与费米子的情况相同。这种跃迁的特征与Brinkman-Rice型跃迁有质的不同。
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英文标题：
《Doublon-Holon Binding Effects on Mott Transitions in Two-Dimensional
  Bose Hubbard Model》
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作者：
Hisatoshi Yokoyama and Masao Ogata
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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：Strongly Correlated Electrons        强关联电子
分类描述：Quantum magnetism, non-Fermi liquids, spin liquids, quantum criticality, charge density waves, metal-insulator transitions
量子磁学，非费米液体，自旋液体，量子临界性，电荷密度波，金属-绝缘体跃迁
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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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英文摘要：
  A mechanism of Mott transitions in a Bose Hubbard model on a square lattice is studied, using a variational Monte Carlo method. Besides an onsite correlation factor, we introduce a four-body doublon-holon factor into the trial state, which considerably improves the variational energy and can appropriately describe a superfluid-insulator transition. Its essense consists in binding (and unbinding) of a doublon to a holon in a finite short range, identical with the cases of fermions. The features of this transition are qualitatively different from those of Brinkman-Rice-type transitions.
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PDF链接：
https://arxiv.org/pdf/708.2765