Interaction-enhanced many-body localization in a generalized Aubry-André model

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Original languageEnglish
Article numberL022054
Journal / PublicationPhysical Review Research
Volume6
Issue number2
Publication statusPublished - 2024

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  • This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/
Link to Scopus https://www.scopus.com/record/display.uri?eid=2-s2.0-85195880887&origin=recordpage
Permanent Link https://scholars.cityu.edu.hk/en/publications/publication(e7fa1d7b-506d-4871-9e6e-db79f47171f6).html

Abstract

We study the many-body localization (MBL) transition in a generalized Aubry-André model (also known as the GPD model) introduced by Ganeshan, Pixley, and Das Sarma [Phys. Rev. Lett. 114, 146601 (2015)]. In contrast to MBL in other disordered or quasiperiodic models, the interaction seems to unexpectedly enhance MBL in the GPD model in some parameter range. To understand this counterintuitive result, we demonstrate that the highest-energy single-particle band in the GPD model is unstable against weak disorder, which leads to this surprising MBL phenomenon in the interacting model. We develop a mean-field theory description to understand the coupling between extended and localized states, which we validate using extensive exact diagonalization and modified density matrix renormalization group (DMRG-X) numerical results. © 2024 American Physical Society.

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100
Interaction Mathematics
100
Model Physics
100
Position (Location) Physics
100
Andr Keyphrases
100
Many-body Localizat... Keyphrases
100
interactions INIS
100
many-body problem INIS
50
Renormalization Mathematics
50
Diagonalization Mathematics
50
Density Matrix Mathematics
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[ RIS ] [ BibTeX ]
Interaction-enhanced many-body localization in a generalized Aubry-André model. / Huang, Ke; Vu, DinhDuy; Das sarma, Sankar et al.
In: Physical Review Research, Vol. 6, No. 2, L022054, 2024.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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