Fallani L, De Sarlo L, Lye J E, Modugno M, Saers R, Fort C, Inguscio M
LENS, Dipartimento di Fisica, and INFM, Università di Firenze, via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy.
Phys Rev Lett. 2004 Oct 1;93(14):140406. doi: 10.1103/PhysRevLett.93.140406. Epub 2004 Sep 29.
We have experimentally studied the unstable dynamics of a harmonically trapped Bose-Einstein condensate loaded into a 1D moving optical lattice. The lifetime of the condensate in such a potential exhibits a dramatic dependence on the quasimomentum state. This is unambiguously attributed to the onset of dynamical instability, after a comparison with the predictions of the Gross-Pitaevskii theory. Deeply in the unstable region we observe the rapid appearance of complex structures in the atomic density profile, as a consequence of the condensate phase uniformity breakdown.
我们通过实验研究了加载到一维移动光学晶格中的简谐捕获玻色-爱因斯坦凝聚体的不稳定动力学。在这种势场中凝聚体的寿命对准动量态表现出显著的依赖性。与格罗斯-皮塔耶夫斯基理论的预测进行比较后，这明确归因于动力学不稳定性的开始。在不稳定区域的深处，由于凝聚体相位均匀性的破坏，我们观察到原子密度分布中迅速出现复杂结构。
