Floquet engineering of individual band gaps in an optical lattice using a two-tone drive

Abstract

The dynamic engineering of band structures for ultracold atoms in optical lattices represents an innovative approach to understand and explore 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 quasi-degenerate 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 multi-photon couplings, as well as interference effects between several commensurate drives.

arXiv comment18 pages, 8 figures

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Cited by in corpus (13)

• Topological pumping in a Floquet-Bloch band
• Topological Floquet engineering using two frequencies in two dimensions
• Photocurrent induced by a bicircular light drive in centrosymmetric systems
• Topological phase transition in commensurate multi-frequency Floquet Su-Schrieffer-Heeger model
• Suppression of inter-band heating for random driving
• Controllable photocurrent generation in Dirac systems with two frequency drives
• Extended unitarity and absence of skin effect in periodically driven systems
• Steering spin fluctuations in lattice systems via two-tone Floquet engineering
• Floquet-Engineering of Feshbach Resonances in Ultracold Gases
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• Ultracold atomic lattice systems for simulating topological phases: A review
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• Localization and topological signatures under periodic twisting