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arXiv 2412.15331cond-mat.stat-mechcond-mat.dis-nncond-mat.str-elquant-ph
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渐隐遍历性的标度理论

Scaling theory of fading ergodicity

Rafał Świętek, Miroslav Hopjan, Carlo Vanoni, Antonello Scardicchio, Lev Vidmar

AI总结:

本文提出渐隐遍历性的标度理论,揭示双参数标度如何支配遍历区域,并在遍历性破缺临界点演化为临界指数为1的单参数标度,为多体系统标度理论提供基础框架。

摘要:

在大多数无相互作用量子系统中,局域化的标度理论预言了遍历区和局域区中的单参数标度流。另一方面,人们预期单参数标度假设在表现出多体遍历性破缺转变的相互作用系统中会失效。在此,我们引入渐隐遍历性的标度理论,渐隐遍历性是多体遍历性破缺的前兆区域。我们认为双参数标度支配整个遍历区域;然而,(i) 它在遍历性破缺临界点演化为单参数标度,其临界指数为 $ν=1$,并且 (ii) 它在接近 ETH 点处产生了具有鲁棒性的单参数标度。我们的理论框架可以作为多体系统双参数标度理论的一个构建模块。

英文摘要:

In most noninteracting quantum systems, the scaling theory of localization predicts one-parameter scaling flow in both ergodic and localized regimes. On the other hand, it is expected that the one-parameter scaling hypothesis breaks down for interacting systems that exhibit the many-body ergodicity breaking transition. Here we introduce a scaling theory of fading ergodicity, which is a precursor regime of many-body ergodicity breaking. We argue that the two-parameter scaling governs the entire ergodic regime; however, (i) it evolves into the one-parameter scaling at the ergodicity breaking critical point with the critical exponent $ν=1$, and (ii) it gives rise to the resilient one-parameter scaling close to the ETH point. Our theoretical framework may serve as a building block for two-parameter scaling theories of many-body systems.

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