Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 87: Metal Substrates: Structure, Epitaxy and Growth

O 87.11: Vortrag

Donnerstag, 10. März 2016, 17:45–18:00, S053

Decay of isolated Hills and Saddles on Si(001) studied by LEEM — •Pierre Kirschbaum¹, Lothar Brendel¹, Kelly R. Roos², Michael Horn-von Hoegen¹, and Frank-J. Meyer zu Heringdorf¹ — ¹Faculty of Physics and Center of Nanointegration (CeNIDE), University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg — ²Present Adress: Faculty of Engineering and Physics, Bradley University, Preoria, IL 61625

Dark field low energy electron microscopy is used to study the high temperature decay of isolated hills and saddle points on Si(001). We find different temperature dependent decay rates for the top of the hill compared to a saddle point with low step density that is present in the vicinity of the hill. The decay rate of the hill is always higher than the decay rate at the saddle. The two rates converge with increasing temperature and become equal at temperatures above 1060°C. We also report an alternating fast and slow decay rate for the layer-by-layer decay of the hills. This surprising finding is independent of temperature and is explained by macroscopic strain in the sample. In-situ deposition of Au on the Si(001) surface increases the decay rates of the hill and saddle by more than a factor of ten.