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We study a two-dimensional model for interacting colloidal particles whichdisplays spontaneous clustering. Within this model we investigate thecompetition between the pinning to a periodic corrugation potential, and asideways constant pulling force which would promote a sliding state. For a fewsample particle densities and amplitudes of the periodic corrugation potentialwe investigate the depinning from the statically pinned to the dynamicallysliding regime. This sliding state exhibits the competition between a dynamicswhere entire clusters are pulled from a minimum to the next and a dynamicswhere single colloids or smaller groups leave a cluster and move across thecorrugation energy barrier to join the next cluster downstream in the forcedirection. Both kinds of sliding states can occur either coherently across theentire sample, or asynchronously: the two regimes result in different averagemobilities. Finite temperature tends to destroy separate sliding regimes,generating a smoother dependence of the mobility on the driving force.

Sliding states of a soft-colloid cluster crystal: Cluster versus single-particle hopping