Multimode-polariton superradiance via Floquet engineering

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 mod...

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Bibliographic Details
Published inSciPost physics Vol. 12; no. 3; p. 094
Main Authors Johansen, Christian H., Lang, Johannes, Morales, Andrea, Baumgärtner, Alexander, Donner, Tobias, Piazza, Francesco
Format Journal Article
LanguageEnglish
Published SciPost 01.03.2022
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Summary: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.
ISSN:2542-4653
2542-4653
DOI:10.21468/SciPostPhys.12.3.094