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Reiter, Doris ; Glanemann, Markus ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Spatiotemporal dynamics in optically excited quantum wire-dot systems : Capture, escape, and wave-front dynamics.
In: Physical Review B.
Bd. 75
(2007)
Heft 20
.
- 205327.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.75.205327
Abstract
Transitions of optically excited carriers between delocalized states in a quantum wire and localized states in a quantum dot are studied on a quantum kinetic level. These transitions are mediated by the emission or absorption of longitudinal optical phonons. Three different excitation scenarios are considered: The capture of a traveling wave packet results in occupations of the bound states and, under suitable conditions, in coherent superpositions. Both occupations and coherences decay due to thermal escape processes resulting from the absorption of phonons. A spatially homogeneous excitation in the quantum wire below the threshold for optical phonon emission leads to capture processes associated with the buildup of a wave front in the carrier density between regions which are already influenced by the capture and regions where this influence is not yet present. A selective excitation of the quantum dot exciton is at elevated temperatures followed by thermal escape processes with a subsequent spreading of the carriers in the quantum wire. We find that for a physically meaningful description of the spatiotemporal dynamics a consistent treatment of both diagonal and off-diagonal density matrix elements is essential in all three scenarios.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | quantum dot; quantum wire; quantum kinetics; wave packet transport; carrier capture; carrier escape; phonon induced capture; LO phonons; wave front dynamics |
| Institutionen der Universität: | Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt Fakultäten Fakultäten > Fakultät für Mathematik, Physik und Informatik Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Eingestellt am: | 25 Okt 2017 08:23 |
| Letzte Änderung: | 02 Aug 2023 13:15 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/40165 |