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Distributional ergodicity in stored-energy-driven Lévy flights
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Description
We study a class of random walk, the stored-energy-driven L��vy flight (SEDLF), whose jump length is determined by a stored energy during a trapped state. The SEDLF is a continuous-time random walk with jump lengths being coupled with the trapping times. It is analytically shown that the ensemble-averaged mean square displacements exhibit subdiffusion as well as superdiffusion, depending on the coupling parameter. We find that time-averaged mean square displacements increase linearly with time and the diffusion coefficients are intrinsically random, a manifestation of {\it distributional ergodicity}. The diffusion coefficient shows aging in subdiffusive regime, whereas it increases with the measurement time in superdiffusive regime.
7 pages, 6 figures
Journal
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- Physical Review E
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Physical Review E 87 (6), 062134-, 2013-06-24
American Physical Society (APS)