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Scaling dimensions of higher-charge monopoles at deconfined critical points

机译:高电荷单极子在受限临界点的尺度尺寸

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摘要

The classical cubic dimer model has a columnar ordering transition that is continuous and described by a critical Anderson-Higgs theory containing an SU(2)-symmetric complex field minimally coupled to a noncompact U(1) gauge theory. Defects in the dimer constraints correspond to monopoles of the gauge theory, with charge determined by the deviation from unity of the dimer occupancy. By introducing such defects into Monte Carlo simulations of the dimer model at its critical point, we determine the scaling dimensions y_2 = 1.48 ± 0.07 and y_3 = 0.20 ± 0.03 for the operators corresponding to defects of charge q = 2 and 3, respectively. These results, which constitute the first direct determination of the scaling dimensions, shed light on the deconfined critical point of spin-1/2 quantum antiferromagnets, thought to belong to the same universality class. In particular, the positive value of y_3 implies that the transition in the J Q model on the honeycomb lattice is of first order.
机译:经典三次二聚体模型具有连续的柱状有序过渡,并由包含最小耦合到非紧致U(1)规范理论的SU(2)对称复数场的临界Anderson-Higgs理论描述。二聚体约束中的缺陷对应于量规理论的单极子,电荷由与二聚体占有率的单位偏差确定。通过将这些缺陷引入二聚体模型的临界点的蒙特卡洛模拟中,我们分别确定了与电荷q = 2和3的缺陷对应的算符的缩放尺寸y_2 = 1.48±0.07和y_3 = 0.20±0.03。这些结果构成了尺度尺寸的第一个直接确定结果,阐明了自旋1/2量子反铁磁体的有限临界点,人们认为它们属于同一普遍性类别。特别地,y_3的正值表示在蜂窝网格上的J Q模型中的跃迁是一阶的。

著录项

  • 来源
    《Physical review》 |2015年第18期|184413.1-184413.11|共11页
  • 作者

    G. J. Sreejith; Stephen Powell;

  • 作者单位

    Max Planck Institute for Physics of Complex Systems, Dresden, Germany;

    School of Physics and Astronomy, The University of Nottingham, Nottingham NG7 2RD, United Kingdom;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    numerical simulation studies;

    机译:数值模拟研究;

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