Super-Arrhenius diffusion in a binary colloidal mixture at low volume fraction: an effect of depletion interaction due to an asymmetric barrier

We report results from the molecular dynamics simulations of a binary colloidal mixture subjected to an external potential barrier along one spatial directions at low volume fraction, {\phi} = 0.2. The variations in asymmetry do not change smaller particles, showing Arrhenius diffusion. However, larger particles shows crossover sub-Arrhenius super-Arrhenius diffusion with temperatures and fraction. Super-Arrhenius is generally observed high density systems where transient cages are present due dense packing, e.g., supercooled liquids, jammed systems, through porous membranes, within cellular environment, etc. This model can be applied study transport across cell nano-, micro-channels which characterized by spatially asymmetric potentials.