论文标题
自动相关障碍对多体定位过渡附近动力学的影响
Effects of auto-correlated disorder on the dynamics in the vicinity of the many-body localization transition
论文作者
论文摘要
在相互作用的量子系统中，冷冻不相关的随机现场电位的存在可能会诱导从沿阵行相到局部化的局部阶段，即所谓的多体定位。在这里，我们从数字上研究自动相关疾病对一维多体量子系统的静态和动力学特性的影响，该系统表现出多体定位。具体而言，通过对能量特征状态的能量水平排斥和本地化的一些标准测量，我们表明，一维自旋1/2 Heisenberg模型中的现场电位之间的相关程度很强，导致抑制多体体的定位阶段，而较小的扰动阶段则可以减轻能量障碍的力量，尽管能量疾病的强度仍然很好地扩展了良好的Eigentates exters extextates。我们的发现也非常明显地体现在时域中，我们将主要重点放在其上，如实验相关可观察到的时间演变所示，例如返回概率和自旋自动相关函数。
The presence of frozen uncorrelated random on-site potential in interacting quantum systems can induce a transition from an ergodic phase to a localized one, the so-called many-body localization. Here we numerically study the effects of auto-correlated disorder on the static and dynamical properties of a one-dimensional many-body quantum system which exhibits many-body localization. Specifically, by means of some standard measures of energy level repulsion and localization of energy eigenstates, we show that a strong degree of correlations between the on-site potentials in the one-dimensional spin-1/2 Heisenberg model leads to suppression of the many-body localization phase, while level repulsion is mitigated for small disorder strengths, although energy eigenstates remain well extended. Our findings are also remarkably manifested in time domain, on which we put main emphasis, as shown by the time evolution of experimentally relevant observables, like the return probability and the spin auto-correlation function.
