| Zugriffsnummer | 14567 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Ultrafast carrier dynamics around nano-scale Schottky contacts studied by femtosecond far- and near-field optics |
| Autor(in); Institution |
Achermann, M.; Swiss Federal Institute of Technology Zurich, Institute of Quantum Electronics, Zurich, SWITZERLAND
Siegner, Uwe; 4.201, Femtosekunden-Messtechnik, PTB-Braunschweig
Wernersson, L.-E.; Solid State Physics, Nanometer Structure Consortium Lund University, Lund, SWEDEN
Keller, U.; Swiss Federal Institute of Technology Zurich, Institute of Quantum Electronics, Zurich, SWITZERLAND
|
| Quelle/Jahr | Applied Physics Letters: 77 (2000), 21, 3370 - 3372 |
| ISSN | 0003-6951 (PRINT) |
| DOI | |
| Verlag | Melville, NY: AIP |
| Klassifikationscode | PACS: 73.40.Ns ; PACS: 73.30.+y ; PACS: 78.47.+p ; PACS: 73.50.Gr |
| Freie Schlagworte | tungsten ; Schottky barriers ; metal clusters ; high-speed optical techniques ; near-field scanning optical microscopy ; carrier lifetime ; carrier density ; gallium arsenide ; III-V semiconductors ; semiconductor-metal boundaries ; buried layers ; nanotechnology |
| Zusammenfassung | Far- and near-field femtosecond pump-probe spectroscopy has been used to study ultrafast carrier dynamics in matrices of nanometer-scale tungsten discs embedded in GaAs. These studies reveal the dynamics of carrier transfer from a semiconductor into embedded metal clusters in the presence of Schottky contacts and built-in electric fields. The carrier transfer involves transport towards and trapping into the tungsten disks. We find picosecond time constants at higher carrier densities when the built-in field is screened, allowing for efficient carrier transport. Near-field measurements reveal the spatial variation of carrier dynamics. The spatially averaged dynamics can be controlled by the tungsten disk spacing. |
