Structural examination of Au/Ge(001) by surface x-ray diffraction and scanning tunneling microscopy
| Autor: | M. Fiedler, Friedhelm Bechstedt, Ralph Claessen, Philip R. Willmott, T. E. Umbach, S. Sauer, J. Schäfer, C. Blumenstein, Steven J. Leake, S. Meyer |
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| Rok vydání: | 2012 |
| Předmět: |
Surface (mathematics)
Diffraction Materials science FOS: Physical sciences chemistry.chemical_element Germanium 02 engineering and technology 01 natural sciences law.invention Condensed Matter - Strongly Correlated Electrons Optics law 0103 physical sciences Monolayer 010306 general physics Line (formation) Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) business.industry Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Condensed Matter Physics 3. Good health Electronic Optical and Magnetic Materials Crystallography chemistry X-ray crystallography Density functional theory Scanning tunneling microscope 0210 nano-technology business |
| Zdroj: | Physical Review B. 85 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.85.235439 |
| Popis: | The one-dimensional reconstruction of Au/Ge(001) was investigated by means of autocorrelation functions from surface x-ray diffraction (SXRD) and scanning tunneling microscopy (STM). Interatomic distances found in the SXRD-Patterson map are substantiated by results from STM. The Au coverage, recently determined to be 3/4 of a monolayer of gold, together with SXRD leads to three non-equivalent positions for Au within the c(8x2) unit cell. Combined with structural information from STM topography and line profiling, two building blocks are identified: Au-Ge hetero-dimers within the top wire architecture and Au homo-dimers within the trenches. The incorporation of both components is discussed using density functional theory and model based Patterson maps by substituting Germanium atoms of the reconstructed Ge(001) surface. 5 pages, 3 figures |
| Databáze: | OpenAIRE |
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