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Multimode-polariton superradiance via Floquet engineering
by Christian Høj Johansen, Johannes Lang, Andrea Morales, Alexander Baumgärenter, Tobias Donner, Francesco Piazza
|As Contributors:||Christian H. Johansen|
|Arxiv Link:||https://arxiv.org/abs/2011.12309v3 (pdf)|
|Date submitted:||2021-11-24 08:04|
|Submitted by:||Johansen, Christian H.|
|Submitted to:||SciPost Physics|
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.
List of changes
- More thorough comparison with ref.  added to the introduction.
- Discussion of the effective cavity-mode coupling of Fig.4 (b) added to section 3.B.
- Changed cross colours of fig. 4.
- Clarified outlook.
Submission & Refereeing History
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