Schematic view of the 2D FK model. The red balls represent the particles. The substrate potential is shown by the gray-scale map. The letters A-J indicate the possible sites from the initial site O in a single period of ac drive. The eight nearest and next neighbors distribute in the larger and smaller blue circles, respectively.
(a) and (b) Longitudinal velocity ⟨V x ⟩ and transverse velocity ⟨V y ⟩ vs F dc for different F ac , respectively. To clarify, the curves have been systematically shifted in the y direction by 0.2, 0.4, and 0.6, respectively. (c) Angle ⟨θ⟩ in a single period for F ac = 0.2.
The width ΔF and the critical depinning force F c as a function of ac amplitude, in (a) ΔF 1, (b) , (c) ΔF 2, and , where F c are plotted for the sake of comparison with ΔF.
The substrate potential maxima (red dots), an arbitrary particle (black dot in Fig. 4(a)), and the orbits of the particle (black line) for different amplitudes F ac .
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