Mott Transition for a Lieb-Liniger Gas in a Shallow Quasiperiodic Potential: Delocalization Induced by Disorder

Disorder or quasidisorder is known to favor localization in many-body Bose systems. Here, in contrast, we demonstrate an anomalous delocalization effect induced by incommensurability in quasiperiodic lattices. Loading ultracold atoms in two shallow periodic lattices with equal amplitude and either equal or incommensurate spatial periods, we show the onset of a Mott transition not only in the periodic case but also in the quasiperiodic case. Switching from periodic to quasiperiodic potential with the same amplitude, we find that the Mott insulator turns into a delocalized superfluid. Our experimental results agree with quantum Monte Carlo calculations, showing this anomalous delocalization induced by the interplay between the disorder and interaction.

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Publication Details

Journal
Physical Review Letters
Published
2024-09-19
DOI
https://doi.org/10.1103/physrevlett.133.123401
Citations
9
Primary Topic
Cold Atom Physics and Bose-Einstein Condensates
Type
article
Field-Weighted Citation Impact
3.04

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article

Mott Transition for a Lieb-Liniger Gas in a Shallow Quasiperiodic Potential: Delocalization Induced by Disorder

Thierry Giamarchi, Chiara D’Errico, Laurent Sanchez-Palencia, Hepeng Yao et al.
9 citations
Physical Review Letters
Cold Atom Physics and Bose-Einstein Condensates
3.04
article

Mott Transition for a Lieb-Liniger Gas in a Shallow Quasiperiodic Potential: Delocalization Induced by Disorder

Thierry Giamarchi, Chiara D’Errico, Laurent Sanchez-Palencia, Hepeng Yao, Giovanni Carlo Modugno, Luca Tanzi
article en
9 citations

Abstract

Disorder or quasidisorder is known to favor localization in many-body Bose systems. Here, in contrast, we demonstrate an anomalous delocalization effect induced by incommensurability in quasiperiodic lattices. Loading ultracold atoms in two shallow periodic lattices with equal amplitude and either equal or incommensurate spatial periods, we show the onset of a Mott transition not only in the periodic case but also in the quasiperiodic case. Switching from periodic to quasiperiodic potential with the same amplitude, we find that the Mott insulator turns into a delocalized superfluid. Our experimental results agree with quantum Monte Carlo calculations, showing this anomalous delocalization induced by the interplay between the disorder and interaction.

Physical Review LettersVol. 133(12)
University of Geneva (CH), École Polytechnique (FR), Institute for Sustainable Plant Protection (IT), National Institute of Optics (IT), European Theoretical Spectroscopy Facility (BE), University of Florence (IT)
Agence Nationale de la Recherche, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Centre National de la Recherche Scientifique, Institut Henri Poincaré, Laboratoire d’excellence Physique Atomes Lumière Matière, Horizon 2020 Framework Programme
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Openalex Percentile: Top 8%
Cold Atom Physics and Bose-Einstein Condensates
3.04
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