Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 10: Nanostructures at Surfaces I

O 10.8: Vortrag

Montag, 11. März 2013, 12:15–12:30, H45

Field equation for pattern formation on ion-beam eroded surfaces including redepositional effects — •Marc Osthues, Christian Diddens, and Stefan Linz — Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster

In the last decades various self-assembled spatially ordered nanopatterns on semiconductor surfaces generated by low-energy ion-beam erosion have been found in experiments. We have studied a modified damped Kuramoto-Sivashinsky equation as one representative continuum model for the formation of these surface patterns. Previous works [1,2] on modeling the redeposition mechanism taking place during the erosion process suggested that it is appropriate to take a linear and quadratic damping term into account. Using numerical simulations and approximate analytical calculations, we show that the resulting field equation for the evolution of the surface morphology for normal ion incidence exhibits a variety of patterns, such as hexagonal dot and hole structures as well as ripple structures as a function of the parameters of the system.

[1] C. Diddens, S. J. Linz, unpublished

[2] N. Anspach, S. J. Linz, J. Stat. Mech., P06023 (2010)