Fluctuating Diffusivity Emerges even in Binary Gas Mixtures
arXiv:2207.05424 · doi:10.1103/PhysRevE.107.014605
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.
arXiv comment20 pages, 12 figures
References in corpus (14)
- Dynamical heterogeneities in a supercooled Lennard-Jones liquid
- Universal nature of particle displacements close to glass and jamming transitions
- Brownian yet non-Gaussian diffusion: from superstatistics to subordination of diffusing diffusivities
- "Diffusing diffusivity": A model for anomalous and "anomalous yet Brownian" diffusion
- Anomalous diffusion and ergodicity breaking in heterogeneous diffusion processes
- Heterogeneous Diffusion in Highly Supercooled Liquids
- Multiple Excitation of Confined Graphene Plasmons by Single Free Electrons
- Universal relation between instantaneous diffusivity and radius of gyration of proteins in aqueous solution
- Fluctuation Analysis of Time-Averaged Mean-Square Displacement for Langevin Equation with Time-Dependent and Fluctuating Diffusivity
- Langevin equation with fluctuating diffusivity: a two-state model
- Relaxation Functions of Ornstein-Uhlenbeck Process with Fluctuating Diffusivity
- Elucidating fluctuating diffusivity in center-of-mass motion of polymer models with time-averaged mean-square-displacement tensor
- Collisional statistics of the hard-sphere gas
- Fractal and knot-free chromosomes facilitate nucleoplasmic transport
Cited by in corpus (4)
- Anomalous statistics in the Langevin equation with fluctuating diffusivity: from Brownian yet non-Gaussian diffusion to anomalous diffusion and ergodicity breaking
- Gas Diffusion in Cement Pastes: An Analysis using a Fluctuating Diffusivity Model
- Brownian Yet Non-Gaussian Diffusion of a Light Particle in Heavy Gas: Lorentz Gas Based Analysis
- Increase in rod diffusivity emerges even in Markovian nature