Multimode-polariton superradiance via Floquet engineering
- URL: http://arxiv.org/abs/2011.12309v4
- Date: Sat, 15 Jan 2022 17:10:57 GMT
- Title: Multimode-polariton superradiance via Floquet engineering
- Authors: Christian H{\o}j Johansen, Johannes Lang, Andrea Morales, Alexander
Baumg\"artner, Tobias Donner, Francesco Piazza
- Abstract summary: We consider an ensemble of ultracold bosonic atoms within a near-planar cavity, driven by a far detuned laser.
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 of excitation of the atomic cloud.
- Score: 55.41644538483948
- License: http://creativecommons.org/licenses/by/4.0/
- 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.
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