Disorder-induced Fickian, yet non-Gaussian diffusion in heterogeneous media

• DOI: 10.1103/physrevresearch.2.022020
• Publication Date: 2020-04-29T16:08:08Z
• Authors: Indrani Chakraborty; Yael Roichman
• Keywords: Anomalous Diffusion; Constant (computer programming); TRACER; Gaussian network model

This paper shows how disorder in the arrangement of obstacles induces Fickian yet non-Gaussian diffusion tracer particles. The authors show that superstatistical behavior, arising from spatial heterogeneity, leads to non-Gaussianity via two coupled physical mechanisms.