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- W2029149282 startingPage "2295" @default.
- W2029149282 abstract "Employing Monte Carlo techniques we simulated transport of charge carriers across a binary cubic array of 70ifmmodetimeselsetexttimesfi{}50ifmmodetimeselsetexttimesfi{}50 isoenergetic sites of which only a fraction 0.1ensuremath{le}censuremath{le}1 participates in conduction. Transit pulses, computed for variable wave-function overlap parameter (2ensuremath{alpha}a=3,5,12) become dispersive as c decreases and 2ensuremath{alpha}a increases, although the mean carrier hopping rate is found to be time independent. Dispersion is due to the increase of the total number of hops. Both dispersion parameter and time domain of dispersion are in quantitative agreement with the effective-medium theory of Movaghar et al. describing transport in spatially random systems. However, a second weak dispersive regime extending to longer times has been identified. It is attributed to pseudopercolative transport at low site concentration. If the site energies are subjected to a Gaussian distribution of width ensuremath{sigma}=0.12 and ensuremath{sigma}/kT=3.48, dispersion becomes energy-disorder controlled. It is argued that pure R hopping dispersion is not observable in real systems because of nonvanishing diagonal disorder even in substitutionally diluted molecular crystals." @default.
- W2029149282 created "2016-06-24" @default.
- W2029149282 creator A5080184276 @default.
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- W2029149282 date "1987-02-15" @default.
- W2029149282 modified "2023-09-25" @default.
- W2029149282 title "Monte Carlo study of dispersive charge-carrier transport in spatially random systems with and without energetic disorder" @default.
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- W2029149282 doi "https://doi.org/10.1103/physrevb.35.2295" @default.
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