论文标题
使用叠加驱动的晶格多次电流逆转
Multiple current reversals using superimposed driven lattices
论文作者
论文摘要
我们证明，可以通过将其他空间定位的晶格叠加在背景晶格的顶部，将颗粒的定向转运多次动态逆转。通过调整叠加晶格的空间位置，可以灵活控制此类逆转的时间尺度。当前逆转背后的主要原理是粒子动力学从混沌到弹道的转化，这使粒子可以探索基础空间的区域，否则无法访问。我们的结果可以通过在驱动的光学晶格中的冷原子实验实现，并允许控制此类设置中原子团的运输。
We demonstrate that directed transport of particles in a two dimensional driven lattice can be dynamically reversed multiple times by superimposing additional spatially localized lattices on top of a background lattice. The timescales of such current reversals can be flexibly controlled by adjusting the spatial locations of the superimposed lattices. The key principle behind the current reversals is the conversion of the particle dynamics from chaotic to ballistic, which allow the particles to explore regions of the underlying phase space which are inaccessible otherwise. Our results can be experimentally realized using cold atoms in driven optical lattices and allow for the control of transport of atomic ensembles in such setups.
