arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2206.08387cond-mat.dis-nn
收藏

自关联无序对多体局域化相变附近动力学的影响

Effects of auto-correlated disorder on the dynamics in the vicinity of the many-body localization transition

Isaías Vallejo-Fabila, E. Jonathan Torres-Herrera

摘要:

在相互作用量子系统中,冻结的非关联随机在位势的存在可以引起从遍历相到定域相的跃迁,即所谓的多体局域化。本文数值研究了自关联无序对具有多体局域化的一维多体量子系统的静态和动态性质的影响。具体而言,通过一些标准的措施,能级排斥和本地化的能量本征态,我们表明,在一维自旋1/2海森堡模型的现场电位之间的强关联度导致抑制的多体局域化阶段,而级别排斥减轻小的无序强度,虽然能量本征态仍然很好地扩展。我们的研究结果在时间域也得到了显著的体现,我们把重点放在时间域上,如返回概率和自旋自关联函数等实验相关观测量的时间演化所示。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑