Vipin Kerala Varma (Author), Marko Žnidarič (Author)

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.”

Keywords

fizika kondenzirane snovi;condensed matter physics;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FMF - Faculty of Mathematics and Physics
UDC: 538.9
COBISS: 3389284 Link will open in a new window
ISSN: 2469-9950
Views: 646
Downloads: 351
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Other data

Secondary language: Slovenian
Secondary keywords: fizika kondenzirane snovi;
Pages: str. 085105-1-085105-14
Volume: ǂVol. ǂ100
Issue: ǂiss. ǂ8
Chronology: 2019
DOI: 10.1103/PhysRevB.100.085105
ID: 11310551