Anand Shalabh K, Singh Sunil P
Department of Physics, Indian Institute of Science Education and Research, Bhopal 462 066, Madhya Pradesh, India.
Phys Rev E. 2020 Mar;101(3-1):030501. doi: 10.1103/PhysRevE.101.030501.
We investigate conformations and dynamics of a polymer considering its monomers to be active Brownian particles. This active polymer shows very intriguing physical behavior which is absent in an active Rouse chain. The chain initially shrinks with active force, which starts swelling on further increase in force. The shrinkage followed by swelling is attributed purely to excluded-volume interactions among the monomers. In the swelling regime, the chain shows a crossover from the self-avoiding behavior to the Rouse behavior with scaling exponent ν_{a}≈1/2 for end-to-end distance. The nonmonotonicity in the structure is analyzed through various physical quantities; specifically, radial distribution function of monomers, scattering time, as well as various energy calculations. The chain relaxes faster than the Rouse chain in the intermediate force regime, with a crossover in variation of relaxation time at large active force as given by a power law τ_{r}∼Pe^{-4/3} (Pe is Péclet number).
我们将聚合物的单体视为活性布朗粒子，研究其构象和动力学。这种活性聚合物表现出非常有趣的物理行为，而活性Rouse链中不存在这种行为。链最初会因活性力而收缩，随着力的进一步增加开始膨胀。收缩后再膨胀纯粹归因于单体之间的排除体积相互作用。在膨胀状态下，链表现出从自回避行为到Rouse行为的转变，端到端距离的标度指数ν_{a}≈1/2。通过各种物理量分析结构中的非单调性；具体而言，包括单体的径向分布函数、散射时间以及各种能量计算。在中等力 regime下，链的弛豫速度比Rouse链快，在大活性力下弛豫时间的变化出现交叉，由幂律τ_{r}∼Pe^{-4/3}给出（Pe是佩克莱数）。
