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Low-energy singularities in the ground state of fermionic superfluids

机译:铁离子超流体基态的低能奇点

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摘要

We analyze the effects of order-parameter fluctuations on the ground state of fully gapped charge-neutral fermionic superfluids. The Goldstone mode associated with the spontaneously broken symmetry leads to a problem of coupled singularities in d ≤ 3 dimensions. We derive a minimal set of one-loop renormalization group equations which fully captures the interplay of the singularities. The flow equations are based on a symmetry-conserving truncation of a scale-dependent effective action. We compute the low-energy behavior of longitudinal, transverse, and mixed order-parameter correlations, and their impact on the fermionic gap. We demonstrate analytically that cancellations protecting the Goldstone mode are respected by the flow, and we present a numerical solution of the flow equations for the two-dimensional attractive Hubbard model.
机译:我们分析了阶跃参数波动对完全带隙电荷中性铁离子超流体基态的影响。与自然破坏对称性相关的戈德斯通模态导致d≤3维的耦合奇点问题。我们导出了一个最小的单环重整化组方程组,该方程组完全捕获了奇点之间的相互作用。流动方程基于比例依赖的有效动作的对称保留截断。我们计算了纵向,横向和混合阶数参数相关性的低能行为,以及它们对铁离子间隙的影响。我们通过分析证明了流保护了Goldstone模式的抵消,并且为二维有吸引力的Hubbard模型提供了流方程的数值解。

著录项

  • 来源
    《Physical review》 |2013年第14期|144508.1-144508.12|共12页
  • 作者单位

    Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

    Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart, Germany,Carl Zeiss AG, Carl Zeiss Promenade 10, D-07745 Jena, Germany;

    Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

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  • 正文语种 eng
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  • 关键词

    renormalization group methods; lattice fermion models (hubbard model, etc.);

    机译:重归一化组方法;格子费米子模型(哈伯德模型等);

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