K. Kim et al 2009 EPL 88 36002 doi:10.1209/0295-5075/88/36002
K. Kim1, K. Miyazaki2 and S. Saito1
Show affiliationsWe 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 the mode-coupling theory.
64.70.P- Glass transitions of specific systems
Issue 3 (November 2009)
Received 30 April 2009, accepted for publication 17 October 2009
Published 16 November 2009
K. Kim et al 2009 EPL 88 36002
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