Comptes Rendus
Coarsening dynamics at unstable crystal surfaces
Comptes Rendus. Physique, Coarsening dynamics / Dynamique de coarsening, Volume 16 (2015) no. 3, pp. 280-290.

In this paper we focus on crystal surfaces led out of equilibrium by a growth or erosion process. As a consequence of that, the surface may undergo morphological instabilities and develop a distinct structure: undulations, mounds or pyramids, bunches of steps, ripples. The typical size of the emergent pattern may be fixed or it may increase over time through a coarsening process that in turn may last forever or it may be interrupted at some relevant length scale. We study dynamics in three different cases, stressing the main physical ingredients and the main features of coarsening: a kinetic instability, an energetic instability, and an athermal instability.

Nous nous intéressons dans cet article aux surfaces cristallines amenées à s'écarter de l'équilibre par un processus de croissance ou d'érosion. En conséquence de cela, la surface peut subir des instabilités morphologiques et développer une structure distincte : ondulations, monticules ou pyramides, amas de marches, rides. La taille typique du motif émergent peut être fixée ou croître au cours du temps à travers un processus de coarsening qui peut durer éternellement ou s'interrompre au bout d'un certain temps. Nous étudions la dynamique dans trois cas différents, en insistant sur les principaux ingrédients physiques et sur les caractéristiques principales du coarsening : instabilité cinétique, instabilité énergétique, instabilité athermique.

Published online:
DOI: 10.1016/j.crhy.2015.03.003
Keywords: Coarsening, Instability, Crystal growth, Crystal erosion
Mots-clés : Mûrissement, Instabilité, Croissance cristalline, Érosion

Paolo Politi 1

1 Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
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Paolo Politi. Coarsening dynamics at unstable crystal surfaces. Comptes Rendus. Physique, Coarsening dynamics / Dynamique de coarsening, Volume 16 (2015) no. 3, pp. 280-290. doi : 10.1016/j.crhy.2015.03.003. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2015.03.003/

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