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Experimental evidence of the role of compound counting processes in random walk approaches to fractional dynamics
Justyna Trzmiel1, Karina Weron, Aleksander Stanislavsky
1Institute of Physics, Wrocław University of Technology, Wrocław, Poland. justyna.trzmiel@pwr.wroc.pl
Abstract:
We present dielectric spectroscopy data obtained for gallium-doped Cd(0.99)Mn(0.01)Te:Ga mixed crystals, which exhibit a very special case of the two-power-law relaxation pattern with the high-frequency power-law exponent equal to 1. We explain this behavior, which cannot be fitted by any of the well-known empirical relaxation functions, in a subordinated diffusive framework. We propose a diffusion scenario based on a renormalized clustering of a random number of spatio-temporal steps in the continuous-time random walk. Such a construction substitutes the renewal counting process, which is used in the classical continuous time random walk methodology, with a compound counting one. As a result, we obtain an appropriate relaxation function governing the observed nonstandard pattern, and we show the importance of the compound counting processes in studying fractional dynamics of complex systems.
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