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arXiv 2110.03444hep-thcond-mat.stat-mechcond-mat.str-elquant-ph
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Sachdev-Ye-Kitaev模型下非厄米多体量子混沌的对称性分类和普适性

Symmetry Classification and Universality in Non-Hermitian Many-Body Quantum Chaos by the Sachdev-Ye-Kitaev Model

Antonio M. García-García, Lucas Sá, Jacobus J. M. Verbaarschot

摘要:

谱关联是研究量子多体系统动力学的有力工具。对于厄米哈密顿算符,量子混沌运动与随机矩阵理论谱相关有关。基于谱分析在非厄米量子系统中应用的最新进展,我们证明了具有$N$ Majorana费米子的非厄米$q$体Sachdev-Ye-Kitev(nHSYK)模型的局域能级统计,它探测海森堡时间附近的动力学,以及它的手征和复费米子扩展,对于$q > 2$,也可以用随机矩阵理论很好地描述,而对于$q = 2$,它们由泊松统计的等价物给出。为了进行比较,我们将精确对角化数值技术与一些随机矩阵谱可观测量获得的分析结果相结合。此外,根据$q$和$N$,我们确定$19$的$38$的nHSYK模型中的非厄米普适类,包括那些对应于十倍的方式。特别是,我们明确实现$14$的$15$普适性类对应于非伪厄米哈密顿,涉及通用的批量相关类${\rm AI}^\dagger$和${\rm AII}^\dagger$,超越了吉尼布尔合奏。这些结果为非幺正多体量子混沌的普适性提供了强有力的证据,这些普适性特征在任何情况下都可以被含$q > 2$的nHSYK模型捕获.

英文摘要:

Spectral correlations are a powerful tool to study the dynamics of quantum many-body systems. For Hermitian Hamiltonians, quantum chaotic motion is related to random matrix theory spectral correlations. Based on recent progress in the application of spectral analysis to non-Hermitian quantum systems, we show that local level statistics, which probe the dynamics around the Heisenberg time, of a non-Hermitian $q$-body Sachdev-Ye-Kitev (nHSYK) model with $N$ Majorana fermions, and its chiral and complex-fermion extensions, are also well described by random matrix theory for $q > 2$, while for $q = 2$, they are given by the equivalent of Poisson statistics. For that comparison, we combine exact diagonalization numerical techniques with analytical results obtained for some of the random matrix spectral observables. Moreover, depending on $q$ and $N$, we identify $19$ out of the $38$ non-Hermitian universality classes in the nHSYK model, including those corresponding to the tenfold way. In particular, we realize explicitly $14$ out of the $15$ universality classes corresponding to non-pseudo-Hermitian Hamiltonians that involve universal bulk correlations of classes ${\rm AI}^\dagger$ and ${\rm AII}^\dagger$, beyond the Ginibre ensembles. These results provide strong evidence of striking universal features in non-unitary many-body quantum chaos, which in all cases can be captured by nHSYK models with $q > 2$.

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