Floquet engineering nearly flat bands through quantum-geometric light-matter coupling with surface polaritons
Abstract
We investigate Floquet engineering in a sawtooth chain -- a minimal model hosting a nearly flat band endowed with nontrivial quantum geometry -- coupled to driven surface polaritons. In this paradigmatic flat band model, light-matter coupling to a flat band is enabled by quantum geometry despite the vanishing band velocity and band curvature. We show that light polarization and finite momentum transfer in polaritonic settings provide sufficient tunability to flatten or unflatten bands, with sometimes drastic band structure modifications beyond what is attainable with laser pulses in free space. Possible implications for light-driven phenomena in prototypical flat-band moiré or kagome materials are discussed.
Authors 3
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Affiliation as printed
Institute of Theoretical Physics , Faculty of Physics , University of Warsaw , Pasteura 5 , PL-02093 Warsaw , Poland
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RWTH Aachen University · Max Planck Institute for the Structure and Dynamics of Matter · Center for Free-Electron Laser Science
Affiliation as printed
Institut für Theorie der Statistischen Physik , RWTH Aachen University and JARA-Fundamentals of Future Information Technology , 52056 Aachen , Germany
Max Planck Institute for the Structure and Dynamics of Matter , Center for Free-Electron Laser Science (CFEL) , Luruper Chaussee 149 , 22761 Hamburg , Germany
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University of Bremen · Max Planck Institute for the Structure and Dynamics of Matter · Center for Free-Electron Laser Science
Affiliation as printed
Institute for Theoretical Physics and Bremen Center for Computational Materials Science , University of Bremen , 28359 Bremen , Germany
Max Planck Institute for the Structure and Dynamics of Matter , Center for Free-Electron Laser Science (CFEL) , Luruper Chaussee 149 , 22761 Hamburg , Germany
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