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

Title data

Vagov, Alexei ; Axt, Vollrath M. ; Kuhn, Tilmann:
Impact of pure dephasing on the nonlinear optical response of single quantum dots and dot ensembles.
In: Physical Review B. Vol. 67 (2003) Issue 11 . - No. 115338, 16 Seiten.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.67.115338

Project information

Project financing: 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 in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
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
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: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 23 Oct 2017 08:31
Last Modified: 23 Oct 2017 08:31
URI: https://eref.uni-bayreuth.de/id/eprint/40105