at Google ScholarTitle data
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.
Vol. 248
(2011)
Issue 4
.
- pp. 825-828.
ISSN 1521-3951
DOI: https://doi.org/10.1002/pssb.201000783
Abstract in another language
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.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Keywords: | quantum dots; generating functions; exact results; ultrafast dynamics; phonon squeezing; optical excitation; phonon dynamics |
| Institutions of the University: | Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science > 530 Physics |
| Date Deposited: | 30 Oct 2017 13:45 |
| Last Modified: | 30 Aug 2022 11:17 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/40223 |