Universality in the onset of quantum chaos in many-body systems

Universality in the onset of quantum chaos in many-body systems
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多体系统中量子混沌发生的普遍性

DOI:
10.1103/physrevb.104.l201117
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
Rigol, Marcos
Rigol, Marcos
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
LeBlond, Tyler;Sels, Dries;Polkovnikov, Anatoli;Rigol, Marcos

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我们证明了两个多体一维晶格模型,扰动自旋-1/2 XXZ和安德森模型,在无限温度下的量子混沌的发生具有普适性。具体来说,我们表明,量子混沌的发病标志着典型的保真度的最大值,规模与平方的倒数平均能级间距,饱和其上限,并在这些最大值的可积性或本地化打破扰动的强度随系统尺寸的增加而减小。我们还表明,在接近这些最大值时,低于“无”能量(在量子混沌制度)的谱函数发散。我们的研究结果表明,在热力学极限,任意小的可积性或局域化破坏微扰导致量子混沌的多体量子系统在这里研究。
We show that the onset of quantum chaos at infinite temperature in two many-body one-dimensional lattice models, the perturbed spin-1/2 XXZ and Anderson models, is characterized by universal behavior. Specifically, we show that the onset of quantum chaos is marked by maxima of the typical fidelity susceptibilities that scale with the square of the inverse average level spacing, saturating their upper bound, and that the strength of the integrability- or localization-breaking perturbation at these maxima decreases with increasing system size. We also show that the spectral function below the “Thouless” energy (in the quantum-chaotic regime) diverges when approaching those maxima. Our results suggest that, in the thermodynamic limit, arbitrarily small integrability- or localization-breaking perturbations result in quantum chaos in the many-body quantum systems studied here.
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