Interaction instability of localization in quasiperiodic systems

Žnidarič, Marko (avtor), Ljubotina, Marko (avtor)

Integrable models form pillars of theoretical physics because they allow for full analytical understanding. Despite being rare, many realistic systems can be described by models that are close to integrable. Therefore, an important question is how small perturbations influence the behavior of solvable models. This is particularly true for many-body interacting quantum systems where no general theorems about their stability are known. Here, we show that no such theorem can exist by providing an explicit example of a one-dimensional many-body system in a quasiperiodic potential whose transport properties discontinuously change from localization to diffusion upon switching on interaction. This demonstrates an inherent instability of a possible many-body localization in a quasiperiodic potential at small interactions. We also show how the transport properties can be strongly modified by engineering potential at only a few lattice sites.

• Jezik: Angleški jezik
• Ključne besede: condensed matter physics, quantum mechanics, many-body localization, transport, quasiperiodic systems
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2018
• Št. strani: Str. 4595-4600
• Številčenje: Vol. 115, no. 18
• PID: 20.500.12556/RUL-101293
• UDK: 538.9:530.145
• ISSN pri članku: 0027-8424
• DOI: 10.1073/pnas.1800589115
• COBISS.SI-ID: 3201636
• Datum objave v RUL: 22.05.2018

Gradivo je del revije

• Naslov: Proceedings of the National Academy of Sciences of the United States of America
• Skrajšan naslov: Proc. Natl. Acad. Sci. U. S. A.
• Založnik: National Academy of Sciences
• ISSN: 0027-8424
• COBISS.SI-ID: 286487

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fizika kondenzirane snovi, kvantna mehanika, večdelčne lokalizacije, transport, kvaziperiodični sistemi

Projekti

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