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Hopping in a supercooled Lennard-Jones liquid: Metabasins, waiting time distribution, and diffusion

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons47797

Doliwa,  B.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48034

Heuer,  Andreas
MPI for Polymer Research, Max Planck Society;

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Zitation

Doliwa, B., & Heuer, A. (2003). Hopping in a supercooled Lennard-Jones liquid: Metabasins, waiting time distribution, and diffusion. Physical Review E, 67(3): 030501.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-6277-E
Zusammenfassung
We investigate the jump motion among potential energy minima of a Lennard-Jones model glass former by extensive computer simulation. From the time series of minima energies, it becomes clear that the energy landscape is organized in superstructures called metabasins. We show that diffusion can be pictured as a random walk among metabasins, and that the whole temperature dependence resides in the distribution of waiting times. The waiting time distribution exhibits algebraic decays: τ-1/2 for very short times and τ for longer times, where α ≈ 2 near Tc. We demonstrate that solely the waiting times in the very stable basins account for the temperature dependence of the diffusion constant.