Comment on “Self-Diffusion in 2D Dusty-Plasma Liquids: Numerical-Simulation Results”

A Comment on the Letter by Lu-Jing Hou, Alexander Piel, and P. K. Shukla, Phys. Rev. Lett. 102, 085002 (2009). The authors of the Letter offer a Reply.

Figure 1

Bottom: Exponent $\alpha$ vs $\kappa$ for three fixed values of ${\Gamma }^{\mathrm{rel}}$ (full lines and symbols) and ${\Gamma }_{\mathrm{eff}}$ (dashed lines, open symbols, data from Ref. 1). Top: ${\Gamma }^{\mathrm{rel}}(\kappa )$ corresponding to the values ${\Gamma }_{\mathrm{eff}}$ used in Ref. 1.