Spatial Variation of Au Coverage as the Driving Force for Nanoscopic Pattern Formation
In: Physical Review Letters, Vol. 86 (2001), No. 22, pp. 5088 - 5091
2001article/chapter in journal
Physics (incl. Astronomy)Faculty of Physics » Experimental Physics
Related: 1 publication(s)
Title:
Spatial Variation of Au Coverage as the Driving Force for Nanoscopic Pattern Formation
Author:
Meyer zu Heringdorf, FrankUDE
- LSF ID
- 48700
- ORCID
- 0000-0002-5878-2012
- Other
- connected with university
- GND
- 1201039908
- LSF ID
- 10366
- ORCID
- 0000-0003-0324-3457
- Other
- connected with university
Year of publication:
2001
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.