Interaction instability of localization in quasiperiodic systems
Žnidarič, Marko (Author), Ljubotina, Marko (Author)

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Integrable models form pillars of theoretical physics because they allow for full analytical understanding. Despite being rare, many realistic systems can be described by models that are close to integrable. Therefore, an important question is how small perturbations influence the behavior of solvable models. This is particularly true for many-body interacting quantum systems where no general theorems about their stability are known. Here, we show that no such theorem can exist by providing an explicit example of a one-dimensional many-body system in a quasiperiodic potential whose transport properties discontinuously change from localization to diffusion upon switching on interaction. This demonstrates an inherent instability of a possible many-body localization in a quasiperiodic potential at small interactions. We also show how the transport properties can be strongly modified by engineering potential at only a few lattice sites.

Keywords:condensed matter physics, quantum mechanics, many-body localization, transport, quasiperiodic systems
Tipology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Number of pages:Str. 4595-4600
Numbering:Vol. 115, no. 18
ISSN on article:0027-8424
DOI:10.1073/pnas.1800589115 This link opens in a new window
COBISS.SI-ID:3201636 This link opens in a new window
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Record is a part of a journal

Title:Proceedings of the National Academy of Sciences of the United States of America
Shortened title:Proc. Natl. Acad. Sci. U. S. A.
Publisher:National Academy of Sciences
COBISS.SI-ID:286487 This link opens in a new window

Document is financed by a project

Funder:EC - European Commission
Funding Programme:H2020
Project no.:694544
Name:Open many-body non-equilibrium systems

Secondary language

Keywords:fizika kondenzirane snovi, kvantna mehanika, večdelčne lokalizacije, transport, kvaziperiodični sistemi

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