Emergent interaction-induced topology in Bose-Hubbard ladders

Wellnitz, David; Domínguez-Castro, Gustavo A.; Bilitewski, Thomas; Aidelsburger, Monika; Rey, Ana Maria; Santos, Luis

doi:10.1103/PhysRevResearch.7.L012012

Title: Emergent interaction-induced topology in Bose-Hubbard ladders

Journal Article · 17 January 2025 · Physical Review Research

DOI: https://doi.org/10.1103/PhysRevResearch.7.L012012 · OSTI ID:2502132

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We investigate the quantum many-body dynamics of bosonic atoms hopping in a two-leg ladder with strong on-site contact interactions. We observe that when the atoms are prepared in a staggered pattern with pairs of atoms on every other rung, singlon defects, i.e., rungs with only one atom, can localize due to an emergent topological model, even though the underlying model in the absence of interactions admits only topologically trivial states. This emergent topological localization results from the formation of a zero-energy edge mode in an effective lattice formed by two adjacent chains with alternating strong and weak hoping links (Su-Schrieffer-Heeger chains) and opposite staggering which interface at the defect position. Our findings open the opportunity to dynamically generate nontrivial topological behaviors without the need for complex Hamiltonian engineering. Published by the American Physical Society 2025

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Sponsoring Organization:: USDOE

OSTI ID:: 2502132

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 1 Vol. 7; ISSN PPRHAI; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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