Slow dynamics in random media: Crossover from glass to localization transition

Details Slow dynamics in random media: Crossover from glass to localization transition Slow dynamics in random media: Crossover from glass to localization transition

2009-04-29

arxiv.org/abs/0904.4524v3

EPL, 88 (2009) 36002

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures, to appear in EPL

Scientific paper

10.1209/0295-5075/88/36002

We study slow dynamics of particles moving in a matrix of immobile obstacles using molecular dynamics simulations. The glass transition point decreases drastically as the obstacle density increases. At higher obstacle densities, the dynamics of mobile particles changes qualitatively from glass-like to a Lorentz-gas-like relaxation. This crossover is studied by density correlation functions, nonergodic parameters, mean square displacement, and nonlinear dynamic susceptibility. Our finding is qualitatively consistent with the results of recent numerical and theoretical studies on various spatially heterogeneous systems. Furthermore, we show that slow dynamics is surprisingly rich and sensitive to obstacle configurations. Especially, the reentrant transition is observed for a particular configuration, although its origin is not directly linked to the similar prediction based on mode-coupling theory.

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