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Diffusive transport in a quasiperiodic Fibonacci chain: absence of many-body localization at weak interactions
ID Varma, Vipin Kerala (Author), ID Žnidarič, Marko (Author)

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Abstract
We study high-temperature magnetization transport in a many-body spin-1/2 chain with on-site quasiperiodic potential governed by the Fibonacci rule. In the absence of interactions it is known that the system is critical with the transport described by a continuously varying dynamical exponent (from ballistic to localized) as a function of the on-site potential strength. Upon introducing weak interactions, we find that an anomalous noninteracting dynamical exponent becomes diffusive for any potential strength. This is borne out by a boundary-driven Lindblad dynamics as well as unitary dynamics, with agreeing diffusion constants. This must be contrasted to a random potential where transport is subdiffusive at such small interactions. Mean-field treatment of the dynamics for small U always slows down the noninteracting dynamics to subdiffusion, and is therefore unable to describe diffusion in an interacting quasiperiodic system. Finally, briefly exploring larger interactions we find a regime of interaction-induced subdiffusive dynamics, despite the on-site potential itself having no “rare regions.”

Language:English
Keywords:condensed matter physics
Typology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Year:2019
Publication status in journal:Published
Article version:Postprint, final article version, accepted into publication
Number of pages:Str. 085105-1-085105-14
Numbering:Vol. 100, iss. 8
PID:20.500.12556/RUL-113037 This link opens in a new window
UDC:538.9
ISSN on article:2469-9950
DOI:10.1103/PhysRevB.100.085105 This link opens in a new window
COBISS.SI-ID:3389284 This link opens in a new window
Publication date in RUL:29.11.2019
Views:662
Downloads:359
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Record is a part of a journal

Title:Physical review
Publisher:American Physical Society
ISSN:2469-9950
COBISS.SI-ID:2997348 This link opens in a new window

Secondary language

Language:Slovenian
Keywords:fizika kondenzirane snovi

Projects

Funder:EC - European Commission
Funding programme:H2020
Project number:694544
Name:Open many-body non-equilibrium systems
Acronym:OMNES

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:J1-7279
Name:Termodinamika disipativnih nanosistemov

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P1-0402
Name:Matematična fizika

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