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

• URL: http://arxiv.org/abs/2004.11363v1
• Date: Thu, 23 Apr 2020 17:59:11 GMT
• Title: Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate
• Authors: Jinyi Zhang, Christoph Eigen, Wei Zheng, Jake A. P. Glidden, Timon A. Hilker, Samuel J. Garratt, Raphael Lopes, Nigel R. Cooper, Zoran Hadzibabic, Nir Navon
• Abstract summary: We study the decay mechanism of the gapped lowest-lying excitation of a quasi-pure box-trapped atomic Bose-Einstein condensate. We develop a universal theoretical model that explains this fundamental nonlinear damping.
• Score: 1.3573792952910084
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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