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Impact of traveling phonon wave packets on the optical response of quantum dots

Title data

Huneke, Jan ; Kuhn, Tilmann ; Axt, Vollrath M. ; Machnikowski, Paweł:
Impact of traveling phonon wave packets on the optical response of quantum dots.
In: Physica Status Solidi C. Vol. 6 (2009) Issue 2 . - pp. 479-482.
ISSN 1610-1642
DOI: https://doi.org/10.1002/pssc.200880336

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The influence of phonon wave packets created by the optical excitation of a quantum dot (QD) structure on four-wave-mixing (FWM) signals is analyzed theoretically. Two different structures are compared: a single QD in a half-space geometry located close to the surface, where the emitted phonon wave packet after reflection at the surface reenters the QD and a pair of QDs in an infinite medium, where the phonon wave packet created in one QD travels across the other QD. Although the strain fields are very similar pronounced differences in the FWM polarizations are found.In the single QD system we observe clear signatures of the reflected wave packet in the FWM signal at positive delay times, which can also be observed in the time-integrated FWM signal from an inhomogeneously broadened ensemble of such QDs. In the two QD case no signatures of the traveling wave packet are seen in the signal at positive delays and, consequently, in the ensemble signal. However, they are clearly seen in the FWM signal at negative delay times.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dots; strain waves; ultrafast dynamics; generating functions; analytical solutions; optical response
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 09:59
Last Modified: 30 Oct 2017 09:59
URI: https://eref.uni-bayreuth.de/id/eprint/40192