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arXiv 2409.01404cond-mat.stat-mechquant-ph
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晶格系统中的微正则自由累积量

Microcanonical Free Cumulants in lattice systems

Felix Fritzsch, Tomaž Prosen, Silvia Pappalardi

AI总结:

本文提出微正则系综下的自由累积量方法以描述多体动力学,并通过不可积自旋链数值验证其可刻画局域与广延可观测量的完整ETH关联。

摘要:

最近,本征态热化假说(ETH)的完整版本已利用自由概率被系统化。在本文中,我们对微正则系综内多体动力学的自由累积量方法进行了详细讨论。已知后者与正则平均之间的差异会体现在广延算符的时间相关涨落中。因此,微正则系综对于将自由概率的应用扩展到广泛类别的广延可观测量至关重要。我们通过数值方式证明了该方法在有限能量密度下、针对广延可观测量的不可积自旋链哈密顿量中的有效性。我们的结果证实了完整的ETH性质,特别是交叉贡献的抑制和非交叉贡献的因子化,从而表明微正则自由累积量对局域和广延可观测量都编码了ETH平滑关联。

英文摘要:

Recently, the full version of the Eigenstate Thermalization Hypothesis (ETH) has been systematized using Free Probability. In this paper, we present a detailed discussion of the Free Cumulants approach to many-body dynamics within the microcanonical ensemble. Differences between the later and canonical averages are known to manifest in the time-dependent fluctuations of extensive operators. Thus, the microcanonical ensemble is essential to extend the application of Free Probability to the broad class of extensive observables. We numerically demonstrate the validity of our approach in a non-integrable spin chain Hamiltonian for extensive observables at finite energy density. Our results confirm the full ETH properties, specifically the suppression of crossing contributions and the factorization of non-crossing ones, thus demonstrating that the microcanonical free cumulants encode ETH smooth correlations for both local and extensive observables.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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