Floquet engineering of individual band gaps in an optical lattice using a two-tone drive
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Date
2022
Publication Type
Journal Article
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yes
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Abstract
The dynamic engineering of band structures for ultracold atoms in optical lattices represents an innovative approach to understanding and exploring the fundamental principles of topological matter. In particular, the folded Floquet spectrum determines the associated band topology via band inversion. We experimentally and theoretically study two-frequency phase modulation to asymmetrically hybridize the lowest two bands of a one-dimensional lattice. Using quasidegenerate perturbation theory in the extended Floquet space we derive an effective two-band model that quantitatively describes our setting. The energy gaps are experimentally probed via Landau-Zener transitions between Floquet-Bloch bands using an accelerated Bose-Einstein condensate. Separate and simultaneous control over the closing and reopening of these band gaps is demonstrated. We find good agreement between experiment and theory, establishing an analytic description for resonant Floquet-Bloch engineering that includes single- and multiphoton couplings, as well as interference effects between several commensurate drives.
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published
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Journal / series
Volume
4 (1)
Pages / Article No.
13056
Publisher
American Physical Society
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Subject
Cold gases in optical lattices; Landau-Zener effect; Floquet systems; Ultracold gases
Organisational unit
03599 - Esslinger, Tilman / Esslinger, Tilman
Notes
Funding
182650 - Interplay between Topology, Interactions and Dissipation in Driven Quantum Many-Body Systems (SNF)
742579 - Mass, heat and spin transport in interlinked quantum gases (EC)
742579 - Mass, heat and spin transport in interlinked quantum gases (EC)
Related publications and datasets
Is supplemented by: https://doi.org/10.3929/ethz-b-000530754