Democratic particle motion for meta-basin transitions in simple glass-formers Auteur(s): Appignanesi G.A., Fris J.A.R., Montani R.A., Kob W. (Article) Publié: Physical Review Letters, vol. 96 p.057801 (2006) PMID 16486989 DOI: 10.1103/PhysRevLett.96.057801 WoS: 000235252200085 140 Citations Résumé: We use molecular dynamics computer simulations to investigate the local motion of the particles in a supercooled binary liquid. Using the concept of the distance matrix, we find that the alpha relaxation corresponds to a small number of crossings from one metabasin to a neighboring one. Each crossing is very rapid and involves the collective motion of O(40) particles that form a relatively compact cluster, whereas stringlike motions seem not to be relevant for these transitions. These compact clusters are thus potential candidates for the cooperatively rearranging regions proposed a long time ago by Adam and Gibbs. Commentaires: ISI Document Delivery No.: 011FA Times Cited: 0 Cited Reference Count: 26 English Article 0031-9007 057801 |