论文标题
无序SU（2） - 对称浮点系统中的扩展非癌症状态和自旋细胞扩散
Extended nonergodic regime and spin subdiffusion in disordered SU(2)-symmetric Floquet systems
论文作者
论文摘要
我们探索一维无序的SU（2） - 对称浮点模型中的热化和量子动力学，其中非亚伯对称性对多体局部相位。尽管没有本地化，但我们发现该系统表现出非热行为的强障碍的扩展的非癌症状态。在强障碍状态下，水平间距统计量既不显示Wigner-dyson也不表现出泊松分布，并且光谱外形因子在早期时代的时代特征上并未显示出线性的生长。 Floquet本征态的平均纠缠熵是亚热，尽管违反了具有系统尺寸的区域法则。我们进一步计算了局部可观察物的期望值，并发现与本征态热假说的强烈偏差。无限温度自旋自相关功能长时间衰减为$ t^{ - β} $，$β<0.5 $，表明在较强的疾病时进行了延伸。
We explore thermalization and quantum dynamics in a one-dimensional disordered SU(2)-symmetric Floquet model, where a many-body localized phase is prohibited by the non-abelian symmetry. Despite the absence of localization, we find an extended nonergodic regime at strong disorder where the system exhibits nonthermal behaviors. In the strong disorder regime, the level spacing statistics exhibit neither a Wigner-Dyson nor a Poisson distribution, and the spectral form factor does not show a linear-in-time growth at early times characteristic of random matrix theory. The average entanglement entropy of the Floquet eigenstates is subthermal, although violating an area-law scaling with system sizes. We further compute the expectation value of local observables and find strong deviations from the eigenstate thermalization hypothesis. The infinite temperature spin autocorrelation function decays at long times as $t^{-β}$ with $β< 0.5$, indicating subdiffusive transport at strong disorders.
