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A binary mixture of super-paramagnetic colloidal particles is confinedbetween glass plates such that the large particles become fixed and provide atwo-dimensional disordered matrix for the still mobile small particles, whichform a fluid. By varying fluid and matrix area fractions and tuning theinteractions between the super-paramagnetic particles via an external magneticfield, different regions of the state diagram are explored. The mobileparticles exhibit delocalized dynamics at small matrix area fractions andlocalised motion at high matrix area fractions, and the localization transitionis rounded by the soft interactions [T. O. E. Skinner et al, Phys. Rev. Lett.{\bf 111}, 128301 (2013)]. Expanding on previous work, we find the dynamics ofthe tracers to be strongly heterogeneous and show that molecular dynamicssimulations of an ideal gas confined in a fixed matrix exhibit similarbehavior. The simulations show how these soft interactions make the dynamicsmore heterogenous compared to the disordered Lorentz gas and lead to strongnon-Gaussian fluctuations.

Dynamic heterogeneities and non-Gaussian behavior in two-dimensional randomly confined colloidal fluids