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Impact of strain waves traveling across a quantum dot on the optical response of the dot : Distinction between strain waves of different origin

Title data

Huneke, Jan ; Krügel, A. ; Kuhn, Tilmann ; Vagov, Alexei ; Axt, Vollrath M.:
Impact of strain waves traveling across a quantum dot on the optical response of the dot : Distinction between strain waves of different origin.
In: Physical Review B. Vol. 78 (2008) Issue 8 . - No. 085316, 8 Seiten.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.78.085316

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The influence of strain waves traveling across a semiconductor quantum dot on the optical spectra of the lowest quantum dot transition is analyzed. Pure dephasing interactions between electronic and phononic degrees of freedom in quantum dot systems are considered, which represent the most important type of electron-phonon interaction in strongly confined quantum dots. For the case of excitation by ultrafast laser pulses, a generating function formalism provides analytical results, which are exact within the framework of the model. Two situations are compared: (i) a phonon wave packet is generated by the optical excitation of a single-quantum dot near a surface, which after reflection at the surface reenters the quantum dot and (ii) a phonon wave packet is generated by the excitation of a nearby second dot and then travels across the quantum dot. Although the displacement fields passing the dot are almost identical in these two situations, we find that the real time responses as well as the corresponding spectra exhibit qualitative differences and thus allow for a discrimination of phonon wave packets from different origins.

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: 27 Oct 2017 07:04
Last Modified: 30 Oct 2017 10:06
URI: https://eref.uni-bayreuth.de/id/eprint/40186