Fluctuating Diffusivity Emerges even in Binary Gas Mixtures
Statistical Mechanics
2023-02-01 v2 Soft Condensed Matter
Abstract
Diffusivity in some soft matter and biological systems changes with time, called the fluctuating diffusivity. In this work, we propose a novel origin for fluctuating diffusivity based on stochastic simulations of binary gas mixtures. In this system, the fraction of one component is significantly small, and the mass of the minor component molecule is different from that of the major component. The minor component exhibits fluctuating diffusivity when its mass is sufficiently smaller than that of the major component. We elucidate that this fluctuating diffusivity is caused by the time scale separation between the relaxation of the velocity direction and the speed of the minor component molecule.
Cite
@article{arxiv.2207.05424,
title = {Fluctuating Diffusivity Emerges even in Binary Gas Mixtures},
author = {Fumiaki Nakai and Yuichi Masubuchi and Yuya Doi and Takato Ishida and Takashi Uneyama},
journal= {arXiv preprint arXiv:2207.05424},
year = {2023}
}
Comments
20 pages, 12 figures