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.
@article{arxiv.1004.3670,
title = {Space-resolved dynamics of a tracer in a disordered solid},
author = {Thomas Franosch and Markus Spanner and Teresa Bauer and Gerd E. Schröder-Turk and Felix Höfling},
journal= {arXiv preprint arXiv:1004.3670},
year = {2011}
}
Comments
10 pages, 7 figures, submitted to Journal of Non-Crystalline Solids