Evidence for a Dynamical Crossover in a Supercooled Liquid From Analysis of its Potential Energy Landscape
T B. Schroder, Srikanth Sastry, J C. Dyre, S C. Glotzer
We map the dynamics of a supercooled liquid to transitions between successive potential energy basins. In terms of the self intermediate scattering function, Fs (q,t), we demonstrate that the separation of the system=s dynamics into (i) vibrations within potential basins and (ii) transitions between them, becomes valid as a crossover temperature, Tx , is approached. Our results support the previously proposed identification of Tx with the mode coupling critical temperature, Tc. Preliminary results indicate that transitions between inherent structures at T > Tc involve cooperative particle motion.
Physical Review Letters
energy landscape, glassforming liquids, inherent structures, MD simulations
, Sastry, S.
, Dyre, J.
and Glotzer, S.
Evidence for a Dynamical Crossover in a Supercooled Liquid From Analysis of its Potential Energy Landscape, Physical Review Letters
(Accessed June 6, 2023)