Self-Diffusion in 2D Dusty-Plasma Liquids: Numerical-Simulation Results
- IEAP, Christian-Albrechts Universitaet zu Kiel, D-24098 Kiel (Germany)
- Institut fuer Theoretische Physik IV, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany)
We perform Brownian dynamics simulations for studying the self-diffusion in two-dimensional (2D) dusty-plasma liquids, in terms of both mean-square displacement and the velocity autocorrelation function (VAF). Superdiffusion of charged dust particles has been observed to be the most significant at an infinitely small damping rate {gamma} for intermediate coupling strength, where the long-time asymptotic behavior of VAF is found to be the product of t{sup -1} and exp(-{gamma}t). The former represents the prediction of early theories in 2D simple liquids and the latter the VAF of a free Brownian particle. This leads to a smooth transition from superdiffusion to normal diffusion, and then to subdiffusion with an increase of the damping rate. These results well explain the seemingly contradictory observations scattered in recent classical molecular dynamics simulations and experiments of dusty plasmas.
- OSTI ID:
- 21180241
- Journal Information:
- Physical Review Letters, Vol. 102, Issue 8; Other Information: DOI: 10.1103/PhysRevLett.102.085002; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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