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We present a study of the dynamics of small solute particles in a solventmedium where the solute is much smaller in size, mimicking the diffusion ofsmall particles in crowded environment. The solute exhibits Fickian diffusionarising from non-Gaussian Van Hove correlation function. Our study shows thatthere are at least two possible origins of this non-Gaussian behaviour: thedecoupling of the solute-solvent dynamics and the intermittency in the solutemotion, the latter playing a dominant role. In the former scenario whenaveraged over time long enough to explore different solvent environments, thedynamics recovers the Gaussian nature. In the case of intermittent dynamics thenon-Gaussianity remains even after long averaging and the Gaussian behaviour isobtained at a much longer time. Our study further shows that only for anintermediate attractive solute-solvent interaction the dynamics of the soluteis intermittent. The intermittency disappears for weaker or strongerattractions.

Fickian yet non-Gaussian behaviour: A dominant role of the intermittent dynamics