Phys. Rev. Lett. 103, 195001 (2009) [4 pages]Is Diffusion Anomalous in Two-Dimensional Yukawa Liquids?Received 14 August 2009; revised 26 October 2009; published 3 November 2009 There have recently been many predictions of “superdiffusion” in two-dimensional strongly coupled Yukawa systems, both by computer simulations and in dusty plasma experiments, with substantially varying diffusion exponents. Here we show that the results crucially depend on the strength of dissipation and the time instant of the measurement. For sufficiently large friction even subdiffusion is possible. However, there are strong indications that, in the long-time limit, anomalous diffusion vanishes and the system returns to normal diffusion, for dissipative as well as for frictionless systems. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.195001
DOI:
10.1103/PhysRevLett.103.195001
PACS:
52.27.Gr, 52.27.Lw, 66.10.cg, 82.70.Dd
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