Friedman N, Kaplan A, Carasso D, Davidson N
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.
Phys Rev Lett. 2001 Feb 19;86(8):1518-21. doi: 10.1103/PhysRevLett.86.1518.
We report on experimental observations of chaotic and regular motion of ultracold atoms confined by a billiard-shaped optical dipole potential induced by a rapidly scanning laser beam. To investigate the dynamics of the atoms confined by such an "atom-optics" billiard we measure the decay of the number of trapped atoms through a hole on the boundary. A fast and purely exponential decay, the clear signature of chaotic motion, is found for a stadium billiard, but not for a circular or an elliptical billiard, in agreement with theory. We also investigated the effects of decoherence, velocity spread, and gravity on regular and chaotic motion.
我们报告了由快速扫描激光束诱导的台球形状光学偶极势所限制的超冷原子的混沌运动和规则运动的实验观测结果。为了研究受这种“原子光学”台球限制的原子动力学，我们通过边界上的一个孔测量被困原子数的衰减。对于体育场台球，发现了快速且纯粹指数衰减，这是混沌运动的明显特征，但对于圆形或椭圆形台球则未发现，这与理论相符。我们还研究了退相干、速度展宽和重力对规则运动和混沌运动的影响。
