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

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Izvleček
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.”

Jezik:Angleški jezik
Ključne besede:condensed matter physics
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FMF - Fakulteta za matematiko in fiziko
Leto izida:2019
Status objave pri reviji:Objavljeno
Verzija članka:Postprint, avtorjeva končna recenzirana različica članka, sprejeta v objavo
Št. strani:Str. 085105-1-085105-14
Številčenje:Vol. 100, iss. 8
UDK:538.9
ISSN pri članku:2469-9950
DOI:10.1103/PhysRevB.100.085105 Povezava se odpre v novem oknu
COBISS.SI-ID:3389284 Povezava se odpre v novem oknu
Datum objave v RUL:29.11.2019
Število ogledov:635
Število prenosov:347
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Gradivo je del revije

Naslov:Physical review
Založnik:American Physical Society
ISSN:2469-9950
COBISS.SI-ID:2997348 Povezava se odpre v novem oknu

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:fizika kondenzirane snovi

Projekti

Financer:EC - European Commission
Program financ.:H2020
Številka projekta:694544
Naslov:Open many-body non-equilibrium systems
Akronim:OMNES

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:J1-7279
Naslov:Termodinamika disipativnih nanosistemov

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:P1-0402
Naslov:Matematična fizika

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