Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 53: Surface Nanopatterns

O 53.5: Vortrag

Mittwoch, 27. Februar 2008, 16:15–16:30, MA 043

Continuum model for pattern formation on ion-beam eroded surfaces under target rotation — •Karsten Dreimann and Stefan Jakob Linz — Institut für Theoretische Physik, Universität Münster, Wilhelm-Klemm-Straße 9, 48149 Münster, Germany

A recently proposed continuum model [1] for the formation of nanostructures on semiconductor surfaces generated by low-energy ion-beam erosion under normal and oblique ion incidence is generalized to the case of additional target rotation. After transformation, this model takes on the form of a driven damped isotropic Kuramoto-Sivashinsky equation. Primary focus of our investigation [2] is the theoretical analysis of the competition of flat, hexagonal and square-like surface structures as function of the external rotation rate and the sputtering time. As a major result, we find that target rotation stabilizes the occurence of flat surfaces. Comparison with recent experimental results will also be given.

[1] S. Vogel, S.J. Linz, Europhys.Lett. 76, 884-890 (2006)

[2] K. Dreimann, S.J. Linz, unpublished