Marko Žnidarič (Author), Marko Ljubotina (Author)

Abstract

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

fizika kondenzirane snovi;kvantna mehanika;večdelčne lokalizacije;transport;kvaziperiodični sistemi;condensed matter physics;quantum mechanics;many-body localization;quasiperiodic systems;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FMF - Faculty of Mathematics and Physics
UDC: 538.9:530.145
COBISS: 3201636 Link will open in a new window
ISSN: 0027-8424
Views: 1065
Downloads: 420
Average score: 0 (0 votes)
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Other data

Secondary language: Slovenian
Secondary keywords: fizika kondenzirane snovi;kvantna mehanika;večdelčne lokalizacije;transport;kvaziperiodični sistemi;
Pages: str. 4595-4600
Volume: ǂVol. ǂ115
Issue: ǂno. ǂ18
Chronology: 2018
DOI: 10.1073/pnas.1800589115
ID: 10936187