Laboratoire de Physique de la Matière Condensée et Nanostructures, Université Lyon, Villeurbane, France.
Phys Rev Lett. 2012 Aug 3;109(5):056101. doi: 10.1103/PhysRevLett.109.056101. Epub 2012 Jul 31.
We report on the control of the faceting of crystal surfaces by means of surface electromigration. When electromigration reinforces the faceting instability, we find perpetual coarsening with a wavelength increasing as t(1/2). For strongly stabilizing electromigration, the surface is stable. For weakly stabilizing electromigration, a cellular pattern is obtained, with a nonlinearly selected wavelength. The selection mechanism is not caused by an instability of steady states, as suggested by previous works in the literature. Instead, the dynamics is found to exhibit coarsening before reaching a continuous family of stable nonequilibrium steady states.
我们报告了通过表面电迁移来控制晶体表面的分形。当电迁移增强分形不稳定性时，我们发现随着时间的增加，波长以 t(1/2) 的速度增加，从而导致持续的粗化。对于强烈稳定的电迁移，表面是稳定的。对于弱稳定的电迁移，则会得到具有非线性选择波长的细胞图案。选择机制不是由文献中以前的工作所提出的稳定态不稳定性引起的。相反，在达到连续的非平衡稳定态家族之前，发现动力学表现出粗化。
