Spot profile analysis and lifetime mapping in ultrafast electron diffraction: Lattice excitation of self-organized Ge nanostructures on Si(001)
- Ultrafast high energy electron diffraction in reflection geometry is employed to study the structural dynamics of self-organized Germanium hut-, dome-, and relaxed clusters on Si(001) upon femtosecond laser excitation. Utilizing the difference in size and strain state the response of hut- and dome clusters can be distinguished by a transient spot profile analysis. Surface diffraction from {105}-type facets provide exclusive information on hut clusters. A pixel-by-pixel analysis of the dynamics of the entire diffraction pattern gives time constants of 40, 160, and 390 ps, which are assigned to the cooling time constants for hut-, dome-, and relaxed clusters.
| Document Type: | Article |
|---|---|
| Author: | Tim Frigge, Bernd Hafke, Verena Tinnemann, T. Witte, Michael Horn-von Hoegen |
| URN: | urn:nbn:de:bsz:291:415-3479 |
| DOI: | https://doi.org/10.1063/1.4922023 |
| ISSN: | 2329-7778 |
| Parent Title (English): | Structural Dynamics |
| Volume: | 2 |
| Issue: | 3 |
| Pagenumber: | 035101 |
| Language: | English |
| Year of first Publication: | 2015 |
| Release Date: | 2022/11/18 |
| Tag: | cooling; elemental semiconductors; germanium; high energy electron diffraction; high-speed optical techniques; nanostructured materials |
| Impact: | 03.667 (2015) |
| Funding Information: | Deutsche Forschungsgemeinschaft through SFB616 “Energy dissipation at surfaces”. |
| Scientific Units: | Functional Microstructures |
| Innovative Electron Microscopy | |
| Open Access: | Open Access |
| Signature: | INM 2015/58 |
| Licence (German): |  Creative Commons - CC BY - Namensnennung 4.0 International |
