Quasilocalized excitations induced by long-range interactions in translationally invariant quantum spin chains

Lerose, Alessio (author), Žunkovič, Bojan (author), Silva, Alessandro (author), Gambassi, Andrea (author)

We show that long-range ferromagnetic interactions in quantum spin chains can induce spatial quasi-localization of topological magnetic defects, i.e., domain-walls, even in the absence of quenched disorder. Utilizing matrix-product-states numerical techniques, we study the non-equilibrium evolution of initial states with one or more domain-walls under the effect of a transverse field in variable-range quantum Ising chains. Upon increasing the range of these interactions, we demonstrate the occurrence of a sharp transition characterized by the suppression of spatial diffusion of the excitations during the accessible time scale: the excess energy density remains localized around the initial position of the domain-walls. This quasi-localization is accurately reproduced by an effective semiclassical model, which elucidates the crucial role that long-range interactions play in this phenomenon. The predictions of this work can be tested in current experiments with trapped ions.

• Language: English
• Keywords: quantum mechanics, quantum spin chains
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2019
• Number of pages: Str. 121112-1-121112-6
• Numbering: Vol. 99, iss. 12
• PID: 20.500.12556/RUL-107468
• UDC: 530.145
• ISSN on article: 2469-9950
• DOI: 10.1103/PhysRevB.99.121112
• COBISS.SI-ID: 3301988
• Publication date in RUL: 17.04.2019

Record is a part of a journal

• Title: Physical review
• Publisher: American Physical Society
• ISSN: 2469-9950
• COBISS.SI-ID: 2997348

Secondary language

• Language: Slovenian
• Keywords: kvantna mehanika, kvantne spinske verige

Projects

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