期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.060402
关键词
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资金
- EPSRC [EP/R043396/1, EP/N011759/1, EP/P009565/1, EP/K030094/1]
- ERC
- QuantERA
- Trinity College (Cambridge)
- David and Lucile Packard Foundation
- Alfred P. Sloan Foundation
- NSF [1945324]
- Jesus College (Cambridge)
- EU Marie Sklodowska-Curie program [MSCA-IF-2018 840081]
- Royal Society Wolfson Fellowship
- Simons Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1945324] Funding Source: National Science Foundation
- EPSRC [EP/N011759/1, EP/P009565/1, EP/K030094/1, EP/R043396/1] Funding Source: UKRI
The decay mechanism of the gapped lowest-lying axial excitation of a quasipure atomic Bose-Einstein condensate confined in a cylindrical box trap is studied, revealing that the damping mechanism is exclusively nonlinear. This nonlinear damping is explained as a process where two quanta of the gapped lowest excitation mode couple to a higher-energy mode, which subsequently decays into a continuum. Experimental results show quantitative agreement with the predictions of this model, and third-harmonic generation is observed when the system is strongly driven below its lowest resonant frequency, indicating nonlinear behavior.
We study the decay mechanism of the gapped lowest-lying axial excitation of a quasipure atomic Bose-Einstein condensate confined in a cylindrical box trap. Owing to the absence of accessible 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 fundamentally 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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