大周期光晶格中BEC的量子和经典动力学
Quantum and Classical Dynamics of a BEC in a Large-Period Optical Lattice
摘要：
实验研究了Rb-87玻色-爱因斯坦凝聚体在一维光晶格中的衍射。我们使用一系列的晶格周期和时间尺度，包括那些超出拉曼-纳特限制。我们比较的结果，量子力学和经典模拟，定量和定性的协议，分别。经典的模拟预测的包络线的时间演变的衍射图案的形状由焦散线：在经典轨迹的相空间密度的奇点。随着晶格周期的增长，这种行为变得越来越明显。
英文摘要：
We experimentally investigate diffraction of a Rb-87 Bose-Einstein condensate from a 1D optical lattice. We use a range of lattice periods and timescales, including those beyond the Raman-Nath limit. We compare the results to quantum mechanical and classical simulations, with quantitative and qualitative agreement, respectively. The classical simulation predicts that the envelope of the time-evolving diffraction pattern is shaped by caustics: singularities in the phase space density of classical trajectories. This behavior becomes increasingly clear as the lattice period grows.
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