Efficient measurement of linear susceptibilities in molecular simulations: Application to aging supercooled liquids

Details Efficient measurement of linear susceptibilities in molecular simulations: Application to aging supercooled liquids Efficient measurement of linear susceptibilities in molecular simulations: Application to aging supercooled liquids

2007-01-05

arxiv.org/abs/cond-mat/0701094v1

Phys. Rev. Lett. 98, 220601 (2007)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.220601

We propose a new method to measure time-dependent linear susceptibilities in molecular simulations, which does not require the use of nonequilibrium simulations, subtraction techniques, or fluctuation-dissipation theorems. The main idea is an exact reformulation of linearly perturbed quantities in terms of observables accessible in unperturbed trajectories. We have applied these ideas to two supercooled liquids in their nonequilibrium aging regime. We show that previous work had underestimated deviations from fluctuation-dissipation relations in the case of a Lennard-Jones system, while our results for silica are in qualitative disagreement with earlier results.

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