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DS: Dünne Schichten
DS 14: Schichtwachstum
DS 14.4: Vortrag
Mittwoch, 10. März 2004, 15:15–15:30, HS 32
Non-linear effects in the Monte Carlo simulation of sputter-induced surface morphology — •Oluwole E. Yewande, Alexander K. Hartmann, and Reiner Kree — Institute for Theoretical Physics, University of Göttingen, Tammannstr.1, 37077 Göttingen, Germany.
We study the ion-beam sputtering of a solid surface using the (2+1)-dimensional discrete Monte Carlo model on a lattice recently introduced1. We have studied two different surface diffusion mechanisms; one without and the other including a term accounting for Schwoebel barriers, and at times long enough to observe the dependence of long-time effects on surface diffusion. At short times, propagating ripple-like periodic height modulations appear on the surface. The velocity dispersion and the ripple wavelength obey scaling relations that are in qualitative agreement with experimental results2. At long-times, where non-linear effects are significant, the ripples vanish, and the surface topography exhibits the non-linear behaviour S(k) ∼ k−2.5, governed by the Kardar-Parisi-Zhang universality class.
[1] A. K. Hartmann, R. Kree, U. Geyer and M. Kölbel, Phys. Rev. B 65, 193403(2002).
[2] S. Habenicht, K. P. Lieb, J. Koch and A. D. Wieck, Phys. Rev. B 65, 115327(2002).