论文标题
bose-Einstein冷凝物的最低激发的多体衰变
Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate
论文作者
论文摘要
我们研究了被捕获的盒子被捕获的原子玻色 - 因子凝结物的衰减机制。由于缺乏低能模式，或直接耦合到外部浴缸，因此这种激发受到一体（线性）衰减的保护，而阻尼机制仅是非线性的。我们开发了一个通用的理论模型，该模型将这种基本的非线性阻尼解释为一个过程，将两个量子的最低激发模式夫妇的两个量子置于更高的能量模式，随后逐渐衰减连续体。我们发现我们的实验和该模型的预测之间的定量一致性。最后，通过强烈推动系统以下（最低）共振频率下方，我们观察到了第三量音，这是非线性行为的标志。
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.
