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Spontaneous emergence of a spin state for an emitter in a time-varying medium

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Abstract

Time-varying media can dramatically modify the emission of embedded sources by producing time reversed waves refocusing on the source. Here, we show that such a back action can create an angular momentum by setting the source in a spontaneous spin state. We experimentally implement this coupling using self-propelled bouncing droplets sources coupled to the surface waves they emit on a parametrically excited bath. The spin state dynamics result from a self-organized interplay between the source motion and the time reversed waves. The discrete stability analysis agrees with the experimental observations. In addition, we show that these spin states provide a unique opportunity for an experimental access to parameters enabling comparison and calibration of the various existing models.

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Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment: Data used in the article will be made available on request.]

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Acknowledgements

In memory of Yves Couder who would have enjoyed observing these spin states. The authors are grateful to Antonin Eddi, Sander Wildeman and Chloé d’Hardemare for insightful discussions. The authors thank the support of AXA research fund the French National Research Agency LABEX WIFI (ANR-10-LABX-24), and a Freeside Fund #CoS grant. The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Authors and Affiliations

  1. Institut Langevin, ESPCI Paris, Université PSL, CNRS, 1 rue Jussieu, 75005, Paris, France

    Samuel Bernard-Bernardet & Emmanuel Fort

  2. Two Prime, Open Finance Group, Atlanta, USA

    Marc Fleury

Authors
  1. Samuel Bernard-Bernardet
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  2. Marc Fleury
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  3. Emmanuel Fort
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Correspondence to Emmanuel Fort.

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Bernard-Bernardet, S., Fleury, M. & Fort, E. Spontaneous emergence of a spin state for an emitter in a time-varying medium. Eur. Phys. J. Plus 137, 432 (2022). https://doi.org/10.1140/epjp/s13360-022-02646-2

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