Space-resolved dynamics of a tracer in a disordered solid

Details Space-resolved dynamics of a tracer in a disordered solid Space-resolved dynamics of a tracer in a disordered solid

2010-04-21

arxiv.org/abs/1004.3670v1

J. Non-Cryst. Solids 357, 472 (2011)

Physics

Condensed Matter

Statistical Mechanics

10 pages, 7 figures, submitted to Journal of Non-Crystalline Solids

Scientific paper

10.1016/j.jnoncrysol.2010.06.051

The dynamics of a tracer particle in a glassy matrix of obstacles displays slow complex transport as the free volume approaches a critical value and the void space falls apart. We investigate the emerging subdiffusive motion of the test particle by extensive molecular dynamics simulations and characterize the spatio-temporal transport in terms of two-time correlation functions, including the time-dependent diffusion coefficient as well as the wavenumber-dependent intermediate scattering function. We rationalize our findings within the framework of critical phenomena and compare our data to a dynamic scaling theory.

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