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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

Titelangaben

Huneke, Jan ; Krügel, A. ; Kuhn, Tilmann ; Vagov, Alexei ; Axt, Vollrath Martin:
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. Bd. 78 (2008) Heft 8 . - 085316.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.78.085316

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: quantum dots; strain waves; ultrafast dynamics; generating functions; analytical solutions; optical response
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: 27 Okt 2017 07:04
Letzte Änderung: 02 Aug 2023 13:19
URI: https://eref.uni-bayreuth.de/id/eprint/40186