Space-resolved dynamics of a tracer in a disordered solid

作者：Franosch Thomas^*; Spanner Markus; Bauer Teresa; Schroeder Turk Gerd E; Hoefling Felix

来源：Journal of Non-Crystalline Solids, 2011, 357(2): 472-478.

DOI：10.1016/j.jnoncrysol.2010.06.051

• Transport
• Disordered solids
• Porous materials
• Lorentz model

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, the frequency-dependent conductivity, 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.

• 出版日期2011-1-15
• 单位中国科学院金属研究所