arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.01337cond-mat.dis-nncond-mat.str-elquant-ph
收藏

长程相互作用多体定域系统的迁移率边

Mobility edge in long-range interacting many-body localized systems

Rozhin Yousefjani, Abolfazl Bayat

摘要:

随着量子多体系统中无序强度的增加,物质的一个新阶段,即所谓的任何人局域化,在整个光谱中出现。这种转变是能量依赖性的,这种现象称为迁移率边缘,使得与光谱边缘附近的本征态相比,中光谱本征态倾向于定位在更大的无序值处。在长程相互作用系统中,多体局域化变得更加复杂。在这里,通过关注几个量,我们绘制了相图作为无序强度和能谱的函数,对于各种范围的相互作用。无论潜在的跃迁类型是二阶还是Kosterlitz-Thouless,我们的分析始终确定迁移率边缘,即整个光谱的相边界。我们发现,长程相互作用增强的本地化效果,并朝着更小的值的无序相边界的移动。此外,我们建立了一个层次之间的研究量有关其相应的过渡边界和临界指数。有趣的是,我们表明,故意丢弃系统的一些信息可以减轻有限尺寸效应,并提供符合热力学极限的分析预测的结果。

英文摘要:

As disorder strength increases in quantum many-body systems a new phase of matter, the so-called anybody localization, emerges across the whole spectrum. This transition is energy dependent, a phenomenon known as mobility edge, such that the mid-spectrum eigenstates tend to localize at larger values of disorder in comparison to eigenstates near the edges of the spectrum. Many-body localization becomes more sophisticated in long-range interacting systems. Here, by focusing on several quantities, we draw the phase diagram as a function of disorder strength and energy spectrum, for a various range of interactions. Regardless of the underlying transition type, either second-order or Kosterlitz-Thouless, our analysis consistently determines the mobility edge, i.e. the phase boundary across the spectrum. We show that long-range interaction enhances the localization effect and shifts the phase boundary towards smaller values of disorder. In addition, we establish a hierarchy among the studied quantities concerning their corresponding transition boundary and critical exponents. Interestingly, we show that deliberately discarding some information of the system can mitigate finite-size effects and provide results in line with the analytical predictions at the thermodynamic limit.

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。

↑