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Multimode-polariton superradiance via Floquet engineering

by Christian Høj Johansen, Johannes Lang, Andrea Morales, Alexander Baumgärenter, Tobias Donner, Francesco Piazza

Submission summary

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
Academic field: Physics
Specialties:
  • Atomic, Molecular and Optical Physics - Theory
  • Quantum Physics
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.

Current status:
Editor-in-charge assigned


List of changes

- More thorough comparison with ref. [21] 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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Resubmission 2011.12309v3 on 24 November 2021

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