对称光晶格中定向扩散的相位控制
Phase-control of directed diffusion in a symmetric optical lattice
摘要：
我们证明了对称周期势中的定向扩散现象。这已经实现了一维耗散光晶格中的冷原子。光抽运的随机过程导致原子通过周期性结构的扩散动力学，而通过相位调制晶格光束之一来施加打破系统的时间对称性的零平均力。由于系统的时间对称性被打破，原子被设置为定向运动。
英文摘要：
We demonstrate the phenomenon of directed diffusion in a symmetric periodic potential. This has been realized with cold atoms in a one-dimensional dissipative optical lattice. The stochastic process of optical pumping leads to a diffusive dynamics of the atoms through the periodic structure, while a zero-mean force which breaks the temporal symmetry of the system is applied by phase-modulating one of the lattice beams. The atoms are set into directed motion as a result of the breaking of the temporal symmetry of the system.
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