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Pré-Publication, Document De Travail Année : 2020

Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate

Résumé

We study the decay mechanism of the gapped lowest-lying excitation of a quasi-pure box-trapped atomic Bose-Einstein condensate. Owing to the absence of lower-energy modes, or direct coupling to an external bath, this excitation is protected against one-body (linear) decay and the damping mechanism is exclusively nonlinear. We develop a universal theoretical model that explains this fundamental nonlinear damping as a process whereby two quanta of the gapped lowest excitation mode couple to a higher-energy mode, which subsequently decays into a continuum. We find quantitative agreement between our experiments and the predictions of this model. Finally, by strongly driving the system below its (lowest) resonant frequency we observe third-harmonic generation, a hallmark of nonlinear behavior.

Dates et versions

hal-03001644 , version 1 (12-11-2020)

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Jinyi Zhang, Christoph Eigen, Wei Zheng, Jake A. P. Glidden, Timon A. Hilker, et al.. Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate. 2020. ⟨hal-03001644⟩
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