Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-05-13
J. Chem. Phys. 119, 2120 (2003)
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 5 figures
Scientific paper
10.1063/1.1587132
Features of the energy landscape sampled by supercooled liquids are numerically analyzed for several Lennard-Jones like model systems. The properties of quasisaddles (minima of the square gradient of potential energy W=|grad V|^2), are shown to have a direct relationship with the dynamical behavior, confirming that the quasisaddle order extrapolates to zero at the mode-coupling temperature T_MCT. The same result is obtained either analyzing all the minima of W or the saddles (absolute minima of W), supporting the conjectured similarity between quasisaddles and saddles, as far as the temperature dependence of the properties influencing the slow dynamics is concerned. We find evidence of universality in the shape of the landscape: plots for different systems superimpose into master curves, once energies and temperatures are scaled by T_MCT. This allows to establish a quantitative relationship between T_MCT and potential energy barriers for LJ-like systems, and suggests a possible generalization to different model liquids.
Angelani Luca
Ruocco Giancarlo
Sampoli Marco
Sciortino Francesco
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