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Fluctuation properties of phonons generated by ultrafast optical excitation of a quantum dot

Title data

Reiter, Doris ; Wigger, Daniel ; Daniels, J. M. ; Papenkort, Thomas ; Vagov, Alexei ; Axt, Vollrath M. ; 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 0370-1972
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: 02 Nov 2017 12:58
URI: https://eref.uni-bayreuth.de/id/eprint/40223