Chatterjee Rakesh, Chatterjee Sakuntala, Pradhan Punyabrata, Manna S S
CMP Division, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, India.
Department of Theoretical Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700098, India.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Feb;89(2):022138. doi: 10.1103/PhysRevE.89.022138. Epub 2014 Feb 25.
We study a system of interacting particles in a periodically moving external potential, within the simplest possible description of paradigmatic symmetric exclusion process on a ring. The model describes diffusion of hardcore particles where the diffusion dynamics is locally modified at a uniformly moving defect site, mimicking the effect of the periodically moving external potential. The model, though simple, exhibits remarkably rich features in particle transport, such as polarity reversal and double peaks in particle current upon variation of defect velocity and particle density. By tuning these variables, the most efficient transport can be achieved in either direction along the ring. These features can be understood in terms of a traveling density wave propagating in the system. Our results could be experimentally tested, e.g., in a system of colloidal particles driven by a moving optical tweezer.
我们研究了处于周期性移动外部势场中的相互作用粒子系统，该系统基于环上典型对称排斥过程的最简单描述。该模型描述了硬核粒子的扩散，其中扩散动力学在均匀移动的缺陷位点处局部改变，模拟了周期性移动外部势场的影响。该模型虽然简单，但在粒子输运方面展现出非常丰富的特征，比如在改变缺陷速度和粒子密度时粒子流会出现极性反转和双峰现象。通过调节这些变量，可以沿环的任一方向实现最有效的输运。这些特征可以用在系统中传播的行波密度波来理解。我们的结果可以通过实验进行验证，例如在由移动光镊驱动的胶体粒子系统中。
