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Reiter, Doris ; Wigger, Daniel ; Daniels, J. M. ; Papenkort, Thomas ; Vagov, Alexei ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Fluctuation properties of phonons generated by ultrafast optical excitation of a quantum dot.
In: Physica Status Solidi B.
Bd. 248
(2011)
Heft 4
.
- S. 825-828.
ISSN 1521-3951
DOI: https://doi.org/10.1002/pssb.201000783
Abstract
In this paper, the fluctuation properties of phonons after the optical excitation of a quantum dot with an ultrashort laser pulse are studied theoretically. When a single pulse with pulse area π creates an exciton in the system, a coherent phonon state builds up. Fluctuations of coherent states are time independent and equal to the vacuum fluctuations. By an excitation with a π/2 pulse a superposition of ground and exciton state is created. In this case the phonon system becomes entangled with the electronic system. In the phonon subsystem this leads to the formation of a statistical mixture of the vacuum and the coherent state. The fluctuations of this mixture oscillate in time with both the single and the double phonon frequency, but never exhibit squeezing. The discrepancies with the predictions made in a Raman tensor model are briefly discussed. All scenarios are illustrated using the Wigner function.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | quantum dots; generating functions; exact results; ultrafast dynamics; phonon squeezing; optical excitation; phonon 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: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Eingestellt am: | 30 Okt 2017 13:45 |
| Letzte Änderung: | 30 Aug 2022 11:17 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/40223 |