论文标题
域墙在缺陷中熔化
Domain wall melting across a defect
论文作者
论文摘要
我们研究了具有局部杂质的自由气概链中域壁的熔化。我们发现，缺陷以这样的方式增强了量子相关性，即使最小的散点子也会导致纠缠熵的线性生长，以对比清洁系统中的对数行为。利用流体动力学方法和准粒子图片，我们为任意两部分的纠缠熵演变提供了确切的预测。特别是，在缺陷处的对稳定产生会导致远处之间的非本地相关性。我们还表征了超级对数校正，突出了一些通用特征。
We study the melting of a domain wall in a free-fermionic chain with a localised impurity. We find that the defect enhances quantum correlations in such a way that even the smallest scatterer leads to a linear growth of the entanglement entropy contrasting the logarithmic behaviour in the clean system. Exploiting the hydrodynamic approach and the quasiparticle picture, we provide exact predictions for the evolution of the entanglement entropy for arbitrary bipartitions. In particular, the steady production of pairs at the defect gives rise to non-local correlations among distant points. We also characterise the subleading logarithmic corrections, highlighting some universal features.
