Meyer zu Heringdorf, Frank; Schmidt, Th.; Heun, S.; Hild, R.; Zahl, P.; Ressel, B.; Bauer, E.; Horn-von Hoegen, Michael:
Spatial Variation of Au Coverage as the Driving Force for Nanoscopic Pattern Formation
2001
In: Physical Review Letters, Jg. 86 (2001), Heft 22, S. 5088 - 5091
Artikel/Aufsatz in Zeitschrift / Fach: Physik
Fakultät für Physik » Experimentalphysik
Titel:
Spatial Variation of Au Coverage as the Driving Force for Nanoscopic Pattern Formation
Autor(in):
Meyer zu Heringdorf, Frank im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Schmidt, Th.; Heun, S.; Hild, R.; Zahl, P.; Ressel, B.; Bauer, E.; Horn-von Hoegen, Michael im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen
Erscheinungsjahr
2001
Erschienen in:
Physical Review Letters, Jg. 86 (2001), Heft 22, S. 5088 - 5091
ISSN
ISSN
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Abstract:

Au induced faceting of a 4° vicinal Si(001) surface was studied with chemical resolution using soft x-ray photoemission electron microscopy. For the first time a direct and quantitative determination of the local Au coverage in situ and during deposition was possible. Au atoms, necessary for the expansion of (001) terraces, are accummulated from a lattice gas, resulting in a phase separation between Au enriched terraces and Au depleted step bunches. During a second stage Au also adsorbs on the step bunches and transforms them into (119) facets. A simple Monte Carlo simulation shows that the initial coverage difference between terraces and bunches determines the regularity of the formed mesoscopic grating.