Effects of differential mobility on biased diffusion of two species

TL;DR

This paper studies how different particle mobilities affect jamming and phase transitions in a two-species lattice gas under bias, revealing complex phase behavior and drifting ordered structures.

Contribution

It introduces a combined simulation and mean-field approach to analyze the impact of differential mobility on non-equilibrium phase transitions in a lattice gas.

Findings

Identified first order and continuous phase transitions

Mapped out the phase diagram under various conditions

Observed drifting ordered structures in the jammed phase

Abstract

Using simulations and a simple mean-field theory, we investigate jamming transitions in a two-species lattice gas under non-equilibrium steady-state conditions. The two types of particles diffuse with different mobilities on a square lattice, subject to an excluded volume constraint and biased in opposite directions. Varying filling fraction, differential mobility, and drive, we map out the phase diagram, identifying first order and continuous transitions between a free-flowing disordered and a spatially inhomogeneous jammed phase. Ordered structures are observed to drift, with a characteristic velocity, in the direction of the more mobile species.