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Multimode-polariton superradiance via Floquet engineering
by Christian Høj Johansen, Johannes Lang, Andrea Morales, Alexander Baumgärtner, Tobias Donner, Francesco Piazza
This Submission thread is now published as
|Authors (as registered SciPost users):
|Christian H. Johansen
|Johansen, Christian H.
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
Submission & Refereeing History
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Reports on this Submission
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.