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Impact of pure dephasing on the nonlinear optical response of single quantum dots and dot ensembles

Titelangaben

Vagov, Alexei ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Impact of pure dephasing on the nonlinear optical response of single quantum dots and dot ensembles.
In: Physical Review B. Bd. 67 (2003) Heft 11 . - 115338.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.67.115338

Angaben zu Projekten

Projektfinanzierung: Supported by the European Commission within the Future and Emerging Technologies (FET) Project No. IST-1999-11311 (Semiconductor-based implementation of quantum information devices).

Abstract

The nonlinear optical response to ultrafast laser pulses of semiconductor quantum dots coupled to acoustic phonons is discussed on the basis of closed-form analytical results valid for dots in the strong confinement regime. General properties of four-wave-mixing (FWM) signals are derived from the analytical formulas. Numerical results are presented for two-pulse FWM signals from single quantum dots and from dot ensembles in the time and the frequency domains. Interestingly, the initial decay time of the signal is found to depend nonmonotonously on temperature and delay time. In general, the phonon coupling leads to a modulated decay of the time domain optical response which is neither exponential nor Gaussian. The strength of the modulations is influenced by inhomogeneous broadening and temperature as well as by the relative localization lengths of electrons and holes. FWM spectra of single dots evolve from asymmetric functions for coinciding pulses into symmetric spectra for large delays. Nonlinear signals are compared with linear signals revealing striking similarities but also significant differences, e.g., concerning the depth of the initial drop.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: quantum dot; generating functions; non-linear optics; ultrafast dynamics; pure dephasing; phonons; analytical solutions; phonon sidebands; excitons; four-wave mixing; polaron formation; Non-perturbative solution; dot ensemble
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: Nein
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 23 Okt 2017 08:31
Letzte Änderung: 02 Aug 2023 12:48
URI: https://eref.uni-bayreuth.de/id/eprint/40105