论文标题
多体定位在一维光学晶格中，带有斑点障碍
Many-body localization in one dimensional optical lattice with speckle disorder
论文作者
论文摘要
研究了具有斑点障碍的海森堡自旋链的多体定位过渡。这样的模型等同于具有附加斑点字段的光学晶格中无旋转费的系统。我们的数值结果表明，与在实验中通常研究的准二碘潜在相反，斑点疾病中的多体定位转变与不相关的随机疾病的过渡属于同一普遍性类别。这暗示了实验研究的可能性，即稀有的格里菲斯地区的作用以及在多体定位过渡时的千古和局部晶粒相互作用。此外，斑点电位使人们可以研究疾病中相关性在过渡中的作用。我们研究系统的光谱和动力学特性，这些特性集中在对疾病类型及其相关性敏感的观察物上。特别是，长时间的局部不平衡分布提供了一种实验可用的工具，该工具揭示了在相关斑点疾病中的多体局部阶段的深处，甚至在多体局部的深处存在。
The many-body localization transition for Heisenberg spin chain with a speckle disorder is studied. Such a model is equivalent to a system of spinless fermions in an optical lattice with an additional speckle field. Our numerical results show that the many-body localization transition in speckle disorder falls within the same universality class as the transition in an uncorrelated random disorder, in contrast to the quasiperiodic potential typically studied in experiments. This hints at possibilities of experimental studies of the role of rare Griffiths regions and of the interplay of ergodic and localized grains at the many-body localization transition. Moreover, the speckle potential allows one to study the role of correlations in disorder on the transition. We study both spectral and dynamical properties of the system focusing on observables that are sensitive to the disorder type and its correlations. In particular, distributions of local imbalance at long times provide an experimentally available tool that reveals the presence of small ergodic grains even deep in the many-body localized phase in a correlated speckle disorder.
