CONICET | Buscador de Institutos y Recursos Humanos

Dynamic slowdown of liquids, leading to a breakdown of Arrhenius behavior of relaxationand Stokes?Einstein relationship (SER), as the glass transition is approached, is still not fullyunderstood despite decades of study. They are usually associated to the emergence of dynamicheterogeneity, that is, regions or clusters of particles that have high or low mobilities. But thephysical origin of these dynamic heterogeneity, and in particular, the question whether theyhave a structural origin or they are a purely dynamical phenomenon, is still under debate. Inthis work we study through molecular dynamics simulations in a polymer model the dynamicslowdown and the breakdown of SER, in connection with dynamic susceptibility calculatedfor an isoconfigurational ensemble, such that the effects of structure on dynamics can bediscriminated. The onset of structure effects on dynamical behavior is found to be coincidentwith the onset of slow dynamics and SER breakdown.