Ultraslow Growth of Number Entropy in an l-bit Model of Many-Body Localization

Abstract

We demonstrate that slow growth of the number entropy following a quench from a local product state is consistent with many-body localization. To do this we construct a random circuit l-bit model with exponentially localized l-bits and exponentially decaying interactions between them. We observe an ultraslow growth of the number entropy starting from a Néel state, saturating at a value that grows with system size. This suggests that the observation of such growth in microscopic models is not sufficient to rule out many-body localization.

arXiv commentMain: 7 pages, 2 figures. Supplemental material: 7 pages, 9 figures, 1 table, 1 video

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