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Fig. 9 | Materials Theory

Fig. 9

From: Stability and symmetry of ion-induced surface patterning

Fig. 9

Distribution function of the wavelengths corresponding to the surface modes present at time t=0 (red) and after 60 h of exposure (blue), for θ=0°. Note that in case of linear evolution (top), in both the (a) x-direction (b) y-direction, the dominant wavelength present in the spectrum matches closely with the analytical prediction according to linear stability analysis (shown by vertical black line). Nonlinear evolution (bottom) shows a final wavelength that is approximately half the analytical description, indicating the coupling of \(2\vec q\) has taken over the symmetry

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