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arXiv 2609.23811cond-mat.quant-gas

弹道-扩散输运交叉中的鲁棒自旋普适性

Robust Spin Universality Across a Ballistic-to-Diffusive Transport Crossover

Cătălin Paşcu Moca, Ovidiu I. Pâţu, Balázs Dóra

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中文总结 AI 辅助

本文研究开放量子系统中全计数统计的普适性,证明无限U Hubbard链在耗散交叉下自旋涨落保持M-Wright普适类,仅标度时间改变,并解析与数值验证了普适坍缩。

中文摘要 AI 辅助

全计数统计分布是否在相干-非相干交叉中保持其普适类,是开放量子系统中的一个基本问题。我们针对无限U Hubbard链解决了这一问题,表明局域密度退相干改变了输运指数,但并未破坏底层非高斯M-Wright自旋涨落。利用不可穿透动力学固有的精确自旋-电荷组合律,我们追踪了从弹道流到扩散流体动力学的电荷扇区。这一耗散交叉将特征自旋转移宽度从t^{1/4}移至t^{1/8}。尽管标度时间改变,中心自旋特征函数仍一致坍缩到单一M-Wright标度函数上,我们通过解析和数值方法均确认了这一点。

英文摘要

Whether a full counting statistical distribution preserves its universality class across a coherent-to-incoherent crossover is a fundamental question in open quantum systems. We resolve this for the infinite-$U$ Hubbard chain, showing that local density dephasing changes transport exponents without destroying the underlying non-Gaussian M-Wright spin fluctuations. Utilizing the exact spin-charge composition law inherent to impenetrable dynamics, we track the charge sector from ballistic flow to diffusive hydrodynamics. This dissipative crossover shifts the characteristic spin-transfer width from $t^{1/4}$ to $t^{1/8}$. Despite this altered scaling time, the central spin characteristic functions uniformly collapse onto a singular M-Wright scaling function, what we confirm using analytics as well as numerics.

发表机构

  • University of Oradea(奥拉德大学)
  • Budapest University of Technology and Economics(布达佩斯技术与经济大学)
  • Institute for Space Sciences, Bucharest-Măgurele(布加勒斯特-马古雷莱空间科学研究所)

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