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On the equivalence of models with similar low-energy quasiparticles

机译：具有相似低能准粒子的模型的等价性

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摘要

We use a Metropolis algorithm to calculate the finite temperature spectral weight of three related models that have identical quasiparticles at T = 0, if the exchange favors the appearance of a ferromagnetic background. The low-energy behavior of two of the models remains equivalent at finite temperature, however that of the third does not because its low-energy behavior is controlled by rare events due to thermal fluctuations, which transfer spectral weight well below the T = 0 quasiparticle peaks and generate a pseudogaplike phenomenology. Our results demonstrate that having T = 0 spectra with similar quasiparticles is not a sufficient condition to ensure that two models are equivalent, i.e., that their low-energy properties are similar. We also argue that the pseudogaplike phenomenology is quite generic for models of t-J type, appearing in any dimension and for carriers injected into both ferromagnetic and antiferromagnetic backgrounds.
机译：如果交换有利于铁磁背景的出现，我们将使用Metropolis算法来计算在T = 0时具有相同准粒子的三个相关模型的有限温度谱权重。两个模型的低能行为在有限的温度下仍保持相等，但是第三个模型的低能行为并非由于热波动而受到罕见事件的控制，这种罕见事件是由热波动引起的，该事件将光谱权重转移到T = 0准粒子以下达到峰值并产生伪间隙状现象。我们的结果表明，具有类似准粒子的T = 0光谱不足以确保两个模型相等，即它们的低能性质相似。我们还认为，伪间隙样现象对于t-J型模型非常普遍，它以任何维度出现，并且对于注入铁磁和反铁磁背景的载流子也是如此。

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  • 来源
    《Physical review》 |2015年第21期|214422.1-214422.8|共8页
  • 作者

    Mirko M. Moeller; Mona Berciu;

  • 作者单位

    Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z1;

    Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z1,Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z4;

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  • 正文语种 eng
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  • 关键词

    lattice fermion models (hubbard model, etc.); nonmetallic ferromagnetic materials;

    机译：格子费米子模型（哈伯德模型等）;非金属铁磁材料;

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