摘要翻译：
利用Gutzwiller平均场理论和量子Monte Carlo模拟，研究了正方形晶格上具有最近邻(nnn)和次近邻(nnn)跳跃和排斥的硬核扩展玻色子Hubbard模型的基态相图。我们观察到当系统从公度填料中掺杂时，形成了棋盘状、条纹状和四分之一填充晶体结构的超类晶态。在条纹状超晶相中，超流密度具有很强的各向异性；然而，横向分量仍然有限，表明一个真正的二维超流。我们发现，在掺杂后，条纹状超球体通过一级条纹熔化转变直接转变为具有四分之一填充晶体结构的超球体。
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英文标题：
《Supersolidity from defect-condensation in the extended boson Hubbard
  model》
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作者：
Yu-Chun Chen, Roger G. Melko, Stefan Wessel, Ying-Jer Kao
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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：
  We study the ground state phase diagram of the hard-core extended boson Hubbard model on the square lattice with both nearest- (nn) and next-nearest-neighbor (nnn) hopping and repulsion, using Gutzwiller mean field theory and quantum Monte Carlo simulations. We observe the formation of supersolid states with checkerboard, striped, and quarter-filled crystal structures, when the system is doped away from commensurate fillings. In the striped supersolid phase, a strong anisotropy in the superfluid density is obtained from the simulations; however, the transverse component remains finite, indicating a true two-dimensional superflow. We find that upon doping, the striped supersolid transitions directly into the supersolid with quarter-filled crystal structure, via a first-order stripe melting transition.
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PDF链接：
https://arxiv.org/pdf/708.1807