论文标题
AC驱动的周期系统扩散的巨型振荡
Giant oscillations of diffusion in ac-driven periodic systems
论文作者
论文摘要
我们重新审查了由惯性的布朗粒子组成的驱动系统中扩散的问题，该粒子在对称周期性的电势中移动并受到对称的时间周期性力。我们揭示了参数结构域，其中扩散在长期限制中是正常的，并且表现出有趣的巨型阻尼准静脉振荡，这是外部驱动振幅的函数。作为这种效果背后的机制，我们确定了锁定和跑步轨迹数量差异的相应振荡，该轨迹的主要贡献对扩散系数具有主要贡献。我们的发现可以在许多物理系统中进行实验验证，包括胶体颗粒，约瑟夫森结或居住在光学晶格中的冷原子，仅举几例。
We revisit the problem of diffusion in a driven system consisting of an inertial Brownian particle moving in a symmetric periodic potential and subjected to a symmetric time-periodic force. We reveal parameter domains in which diffusion is normal in the long time limit and exhibits intriguing giant damped quasiperiodic oscillations as a function of the external driving amplitude. As the mechanism behind this effect we identify the corresponding oscillations of difference in the number of locked and running trajectories which carries the leading contribution to the diffusion coefficient. Our findings can be verified experimentally in a multitude of physical systems including colloidal particles, Josephson junction or cold atoms dwelling in optical lattices, to name only a few.
