Realization of an anomalous Floquet topological system with ultracold atoms
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Authors
Wintersperger, K
Braun, C
Liberto, MD
Goldman, N
Publication Date
2020-10-01Journal Title
Nature Physics
ISSN
1745-2473
Publisher
Springer Science and Business Media LLC
Volume
16
Issue
10
Pages
1058-1063
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Wintersperger, K., Braun, C., Ünal, F., Eckardt, A., Liberto, M., Goldman, N., Bloch, I., & et al. (2020). Realization of an anomalous Floquet topological system with ultracold atoms. Nature Physics, 16 (10), 1058-1063. https://doi.org/10.1038/s41567-020-0949-y
Abstract
Coherent control via periodic modulation, also known as Floquet engineering, has emerged as a powerful experimental method for the realization of novel quantum systems with exotic properties. In particular, it has been employed to study topological phenomena in a variety of different platforms. In driven systems, the topological properties of the quasienergy bands can often be determined by standard topological invariants, such as Chern numbers, which are commonly used in static systems. However, due to the periodic nature of the quasienergy spectrum, this topological description is incomplete and new invariants are required to fully capture the topological properties of these driven settings. Most prominently, there are two-dimensional anomalous Floquet systems that exhibit robust chiral edge modes, despite all Chern numbers being equal to zero. Here we realize such a system with bosonic atoms in a periodically driven honeycomb lattice and infer the complete set of topological invariants from energy gap measurements and local Hall deflections.
Keywords
cond-mat.quant-gas, cond-mat.quant-gas, quant-ph
Sponsorship
Engineering and Physical Sciences Research Council (EP/P009565/1)
Identifiers
External DOI: https://doi.org/10.1038/s41567-020-0949-y
This record's URL: https://www.repository.cam.ac.uk/handle/1810/336233
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