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Out-of-time-order correlations in the quasiperiodic Aubry-Andre model

机译:拟周期Aubry-Andre模型中的无序相关

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We study out-of-time-ordered correlators (OTOC) in a free fermionic model with a quasiperiodic potential. This model is equivalent to the Aubry-Andre model and features a phase transition from an extended phase to a localized phase at a nonzero value of the strength of the quasiperiodic potential. We investigate five different time regimes of interest for out-of-time-ordered correlators: early, wave front, x = v_Bt, late time equilibration, and infinite time. For the early time regime we observe a power law for all potential strengths. For the precursor time regime preceding the wave front we confirm a recently proposed universal form and use it to extract the characteristic velocity of the wave front for the present model. A Gaussian waveform is observed to work well in the time regime surrounding x = v_Bt, the wave front arrival time. Our main result is for the late time equilibration regime where we derive a finite time equilibration bound for the OTOC, bounding the correlator's distance from its late time value. The bound impose strict limits on equilibration of the OTOC in the extended regime and is valid not only for the Aubry-Andre model but for any quadratic model. Finally, momentum out-of-time-ordered correlators for the Aubry-Andre model are studied where large values of the OTOC are observed at late times at the critical point.
机译:我们在具有准周期电位的自由铁离子模型中研究无序相关器(OTOC)。该模型等效于Aubry-Andre模型,并且具有从扩展相到局部相的相变,其准周期电势强度为非零值。对于无序的相关器,我们研究了五个不同的时间范围:早期,波前,x = v_Bt,后期时间平衡和无限时间。对于早期政权,我们遵守所有潜在优势的幂律。对于波前的前兆时间状态,我们确认了最近提出的通用形式,并使用它来提取当前模型的波前特征速度。观测到高斯波形在x = v_Bt(波前到达时间)周围的时间范围内工作良好。我们的主要结果是针对晚时平衡机制,在该晚时平衡机制中,我们为OTOC导出了有限时间平衡范围,该范围限制了相关器与其晚时值的距离。该界限对扩展状态下的OTOC平衡施加了严格限制,不仅对Aubry-Andre模型有效,而且对任何二次模型均有效。最后,研究了Aubry-Andre模型的动量无序相关器,其中在临界点的较晚时间观察到了较大的OTOC值。

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  • 来源
    《Physical review》 |2020年第2期|024202.1-024202.14|共14页
  • 作者单位

    Department of Physics & Astronomy McMaster University 1280 Main St. W. Hamilton ON Canada L8S 4M1;

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