Anomalous diffusion through coupling to a fractal environment: Microscopic derivation of the "whip-back" effect

Details Anomalous diffusion through coupling to a fractal environment: Microscopic derivation of the "whip-back" effect Anomalous diffusion through coupling to a fractal environment: Microscopic derivation of the "whip-back" effect

2000-04-04

arxiv.org/abs/cond-mat/0004041v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 figure

Scientific paper

10.1209/epl/i2001-00240-x

Two models for quantum Brownian motion - the Oscillator Bath (OB) model and the Random-Band-Matrix (RBM) model - are compared and a relation between the spectral density function I(w) and the variance (Vab)^2 is established. The extension to a fractal environment is then considered and the microscopic origin of anomalous diffusion is discussed. In particular, it is shown that the asymptotic behavior of the normalized velocity auto-correlation function (VACF) is entirely determined by the band form factor. This allows for a microscopic derivation of the "whip-back" effect.

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