Langevin formulation for single-file diffusion.
We introduce a stochastic equation for the microscopic motion of a tagged particle in the single-file model. This equation provides a compact representation of several of the system's properties such as fluctuation-dissipation and linear-response relations, achieved by means of a diffusion noise approach. Most importantly, the proposed Langevin equation reproduces quantitatively the three temporal regimes and the corresponding time scales: ballistic, diffusive, and subdiffusive.
Taloni
Alessandro
A
Massachusetts Institute of Technology, Department of Physics, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. taloni@phys.sinica.edu.tw
Lomholt
Michael A
MA