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Multimode-polariton superradiance via Floquet engineering
by Christian Høj Johansen, Johannes Lang, Andrea Morales, Alexander Baumgärtner, Tobias Donner, Francesco Piazza
Submission summary
| Authors (as registered SciPost users): | Christian H. Johansen · Johannes Lang · Francesco Piazza |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2011.12309v4 (pdf) |
| Date accepted: | Feb. 14, 2022 |
| Date submitted: | Jan. 19, 2022, 8:57 a.m. |
| Submitted by: | Christian H. Johansen |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
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
-Added appendix with derivation for estimation of effective coupling strength between cavity modes
-Fixed typos and ambiguities
Published as SciPost Phys. 12, 094 (2022)