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Wave-packet dynamics and edge transport in anomalous Floquet topological phases
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory. TCM Group, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom, JJ Thomson Avenue.
TCM Group, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom, JJ Thomson Avenue.
2023 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 108, no 6, article id 063314Article in journal (Refereed) Published
Abstract [en]

The possibility of attaining chiral edge modes under periodic driving has spurred tremendous attention both theoretically and experimentally, especially in light of anomalous Floquet topological phases that feature vanishing Chern numbers unlike any static counterpart. We consider here a periodically modulated honeycomb lattice and experimentally relevant driving protocols, which allows us to obtain edge modes of various character in a simple model. We calculate the phase diagram over a wide range of parameters and recover an anomalous topological phase with quasienergy gaps harboring edge states with opposite chirality. Motivated by the advances in single-site control in optical lattices, we investigate wave-packet dynamics localized at the edges in distinct Floquet topological regimes that cannot be achieved in equilibrium. We analyze transport properties in edge modes which originate from the same bands but with support at different quasienergies and sublattices as well as possessing different chiralities. We find that an anomalous Floquet topological phase can in general generate more robust chiral edge motion than a Haldane phase, allowing for more effective loading of the wave packet into edge channels. Our results demonstrate that the rich interplay of wave-packet dynamics and topological edge states can serve as a versatile tool in ultracold quantum gases in optical lattices.

Place, publisher, year, edition, pages
American Physical Society , 2023. Vol. 108, no 6, article id 063314
National Category
Condensed Matter Physics
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URN: urn:nbn:se:kth:diva-342186DOI: 10.1103/PhysRevA.108.063314Scopus ID: 2-s2.0-85181088529OAI: oai:DiVA.org:kth-342186DiVA, id: diva2:1827906
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QC 20240115

Available from: 2024-01-15 Created: 2024-01-15 Last updated: 2024-01-15Bibliographically approved

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Martinez, Miguel F.

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