From elementary steps to structural relaxation: a continuous-time random-walk analysis of a supercooled liquid.
Phys Rev E Stat Nonlin Soft Matter Phys
; 78(1 Pt 1): 011504, 2008 Jul.
Article
en En
| MEDLINE
| ID: mdl-18763958
We show that the dynamics of supercooled liquids, analyzed from computer simulations of the binary mixture Lennard-Jones system, can be described in terms of a continuous-time random walk (CTRW). The required discretization comes from mapping the dynamics on transitions between metabasins. This yields a quantitative link between the elementary step and the full structural relaxation. The analysis involves a verification of the CTRW conditions as well as a quantitative test of the predictions. The wave-vector dependence of the relaxation time and the degree of nonexponentiality can be expressed in terms of the first moments of the waiting time distribution.
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Colección:
01-internacional
Base de datos:
MEDLINE
Tipo de estudio:
Clinical_trials
Idioma:
En
Revista:
Phys Rev E Stat Nonlin Soft Matter Phys
Asunto de la revista:
BIOFISICA
/
FISIOLOGIA
Año:
2008
Tipo del documento:
Article
País de afiliación:
Alemania
Pais de publicación:
Estados Unidos