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arXiv 2109.11279cond-mat.dis-nnquant-ph
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无无序的单粒子迁移率边

Single-Particle Mobility Edge without Disorder

Donny Dwiputra, Freddy P. Zen

摘要:

一维晶格中局域化边和迁移率边的存在通常被认为依赖于无序(或准无序)。研究了无无序晶格在等间距电场作用下的局域化性质。我们分析表明,即使该模型没有淬火无序,该系统表现出一个确切的流动性边缘和本地化制度扩展到弱场,在对比的巨场的本地化一个通常的斯塔克晶格。对于强场,Wannier-Stark阶梯被恢复,局域本征态的数目与间距成反比。此外,我们研究了初始局域激发的时间依赖性,并动态探测了迁移率边缘的存在。

英文摘要:

The existence of localization and mobility edges in one-dimensional lattices is commonly thought to depend on disorder (or quasidisorder). We investigate localization properties of a disorder-free lattice subject to an equally spaced electric field. We analytically show that, even though the model has no quenched disorder, this system manifests an exact mobility edge and the localization regime extends to weak fields, in contrast to gigantic field for the localization of a usual Stark lattice. For strong fields, the Wannier-Stark ladder is recovered and the number of localized eigenstates is inversely proportional to the spacing. Moreover, we study the time dependence of an initially localized excitation and dynamically probe the existence of mobility edge.

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。

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