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Higgs amplitude mode in the vicinity of a (2 + 1)-dimensional quantum critical point: A nonperturbative renormalization-group approach

机译:(2 + 1)维量子临界点附近的希格斯振幅模:一种非扰动的重归一化组方法

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摘要

We study the "Higgs" amplitude mode in the relativistic quantum O(N) model in two space dimensions. Using the nonperturbative renormalization group and the Blaizot-Mendez-Galain-Wschebor approximation (which we generalize to compute four-point correlation functions), we compute the O(N)-invariant scalar susceptibility at zero temperature in the vicinity of the quantum critical point. In the ordered phase, we find a well-defined Higgs resonance for N = 2 and 3 and determine its universal properties. No resonance is found for N ≥ 4. In the disordered phase, the spectral function exhibits a threshold behavior with no Higgs-like peak. We also show that for N = 2, the Higgs mode manifests itself as a very broad peak in the longitudinal susceptibility in spite of the infrared divergence of the latter. We compare our findings with results from quantum Monte Carlo simulations and ∈ = 4 - (d + 1) expansion near d = 3.
机译:我们在两个空间维度上研究相对论量子O(N)模型中的“希格斯”振幅模式。使用非摄动重整化组和Blaizot-Mendez-Galain-Wschebor逼近(我们将其推广为计算四点相关函数),我们在量子临界点附近计算零温度下的O(N)不变标量磁化率。在有序相中,我们找到了N = 2和3的明确定义的希格斯共振,并确定了其通用性质。对于N≥4,未发现共振。在无序相中,光谱函数显示出阈值行为,没有希格斯峰。我们还表明,对于N = 2,尽管后者的红外发散性,但希格斯模式在纵向磁化率中表现为非常宽的峰。我们将我们的发现与量子蒙特卡罗模拟和ε= 4-(d + 1)接近d = 3的结果进行比较。

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  • 来源
    《Physical review》 |2015年第22期|224501.1-224501.14|共14页
  • 作者

    F. Rose; F. Leonard; N. Dupuis;

  • 作者单位

    Laboratoire de Physique Theorique de la Matiere Condensee, CNRS UMR 7600, Universite Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France;

    Laboratoire de Physique Theorique de la Matiere Condensee, CNRS UMR 7600, Universite Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France;

    Laboratoire de Physique Theorique de la Matiere Condensee, CNRS UMR 7600, Universite Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France;

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

    general theory and models of magnetic ordering;

    机译:电磁订购的一般理论和模型;

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