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Multimode-polariton superradiance via Floquet engineering

by Christian Høj Johansen, Johannes Lang, Andrea Morales, Alexander Baumgärtner, Tobias Donner, Francesco Piazza

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Submission summary

Authors (as registered SciPost users): Christian H. Johansen
Submission information
Preprint Link:  (pdf)
Date accepted: 2022-02-14
Date submitted: 2022-01-19 08:57
Submitted by: Johansen, Christian H.
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • Atomic, Molecular and Optical Physics - Theory
  • Quantum Physics
Approach: Theoretical


We consider an ensemble of ultracold bosonic atoms within a near-planar cavity, driven by a far detuned laser whose phase is modulated at a frequency comparable to the transverse cavity mode spacing. We show that a strong, dispersive atom-photon coupling can be reached for many transverse cavity modes at once. The resulting Floquet polaritons involve a superposition of a set of cavity modes with a density excitation of the atomic cloud. The mutual interactions between these modes lead to distinct avoided crossings between the polaritons. Increasing the laser drive intensity, a low-lying multimode Floquet polariton softens and eventually becomes undamped, corresponding to the transition to a superradiant, self-organized phase. We demonstrate the stability of the stationary state for a broad range of parameters.

Published as SciPost Phys. 12, 094 (2022)

List of changes

-Added appendix with derivation of polarization and density response
-Added appendix with derivation for estimation of effective coupling strength between cavity modes
-Fixed typos and ambiguities

Reports on this Submission

Anonymous Report 1 on 2022-1-21 (Invited Report)


In their resubmitted manuscript the authors carefully address all my concerns. In particular adding two new Appendices improved the clarity and comprehension of the theoretical background of the proposal. I now recommend publishing the manuscript in SciPost as it is.

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