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Finite size effects on dynamical heterogeneity are studied in liquid silicawith Molecular Dynamics simulations using the BKS potential model. When thesystem size decreases relaxation times are found to increase in accordance withprevious results in finite-size simulations and confined liquids. It has beensuggested that this increase may be related to a modification of thecooperative motions in confined liquids. In agreement with this hypothesis weobserve a decrease of the dynamical heterogeneities associated to the most andthe least mobile atoms when the size L decreases. However we find that thedecrease of the dynamical aggregation associated to the least mobile atoms ismuch more important than the decrease associated to the most mobile atoms. Thisresult is surprising as the liquid is slowed down. The decrease of theheterogeneous behavior is also in contradiction with the increase of theheterogeneities observed in liquids confined in nanopores. However an increaseof the non-Gaussian parameter appears both in nanopores and in the finite sizesimulations. As the non-Gaussian parameter is usually associated with dynamicalheterogeneities, the increase of the non-Gaussian parameter together with adecrease of dynamical heterogeneity is also surprising.Comment: 18 pages,4 figure

Cooperative motions in a finite size model of liquid silica: an anomalous behavior