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Preprint

Floquet engineering nearly flat bands through quantum-geometric light-matter coupling with surface polaritons

MPS-Authors
/persons/resource/persons258618

Eckhardt,  C.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science (CFEL);

/persons/resource/persons182604

Sentef,  M. A.
Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen;
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

External Resource

https://arxiv.org/abs/2406.01298
(Preprint)

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2406.01298.pdf
(Preprint), 9KB

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Citation

Walicki, M., Eckhardt, C., & Sentef, M. A. (2024). Floquet engineering nearly flat bands through quantum-geometric light-matter coupling with surface polaritons.


Cite as: https://hdl.handle.net/21.11116/0000-000F-5EC8-7
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.