Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Semiconductor substrates: Epitaxy and growth

O 68.7: Vortrag

Donnerstag, 25. März 2010, 12:00–12:15, H42

Symmetry and Shape of Reconstructed Two-dimensional Nanostructures — •Bert Voigtländer, Konstantin Romanyuk, and Vasily Cherepanov — Institute of Bio and Nanosystems (IBN-3), Forschungszentrum Jülich, 52425 Jülich, Germany, and JARA-Fundamentals of Future Information Technology

We show that the symmetry of the shape of reconstructed 2D islands (nanostructures) on reconstructed surfaces can deviate from both the symmetry of the underlying substrate and the symmetry of the reconstruction. Only an analysis of the symmetry of the combined system of reconstructions on substrate and island and of the substrate lattice can deduce predictions for the island shapes (equilibrium shape or steady state growth shape). In explicit case studies we analyze the symmetry of islands on simple cubic (100), fcc(100), fcc(110) and diamond lattice (111) surfaces and present predictions for the expected island shapes. We introduce a general method for the symmetry analysis of the combined system. Our symmetry analysis includes as a special case also the symmetry of any kind of epitaxial reconstruction domain surrounded by a reconstruction at a surface.