Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1999-01-25
J. Chem. Phys. 112, 9834 (2000)
Physics
Condensed Matter
Soft Condensed Matter
Expanded from 4 to 7 pages
Scientific paper
10.1063/1.481621
An equilibrated model glass-forming liquid is studied by mapping successive configurations produced by molecular dynamics simulation onto a time series of inherent structures (local minima in the potential energy). Using this ``inherent dynamics'' approach we find direct numerical evidence for the long held view that below a crossover temperature, $T_x$, the liquid's dynamics can be separated into (i) vibrations around inherent structures and (ii) transitions between inherent structures (M. Goldstein, J. Chem. Phys. {\bf 51}, 3728 (1969)), i.e., the dynamics become ``dominated'' by the potential energy landscape. In agreement with previous proposals, we find that $T_x$ is within the vicinity of the mode-coupling critical temperature $T_c$. We further find that at the lowest temperature simulated (close to $T_x$), transitions between inherent structures involve cooperative, string like rearrangements of groups of particles moving distances substantially smaller than the average interparticle distance.
Dyre Jeppe C.
Glotzer Sharon C.
Sastry Srikanth
Schroeder Thomas B.
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