Lancaster EPrints

Monitoring the buildup of the quantum dot polaron: Pump-probe and four-wave mixing spectra from excitons and biexcitons in semiconductor quantum dots.

Krugel, A. and Vagov, A. and Axt, V. M. and Kuhn, T. (2007) Monitoring the buildup of the quantum dot polaron: Pump-probe and four-wave mixing spectra from excitons and biexcitons in semiconductor quantum dots. Physical Review B, 76 (19). p. 195302. ISSN 1550-235X

Full text not available from this repository.

Abstract

Pump-probe (PP) and four-wave mixing (FWM) signals from a single quantum dot are presented which are based on a four-level quantum dot model, accounting for the fine structure splitting as well as for the biexciton binding and phonon-induced pure dephasing. We have derived closed form analytical expressions for the PP and FWM polarization components in the time domain after excitation with a pair of ultrafast laser pulses. The solutions are exact within this model. We discuss the dependence of the signals on the polarization of the exciting pulses. We show that for PP spectra after excitation with collinearly polarized pulses and for FWM spectra after cocircular excitation changes in the line shape are entirely due to the polaron formation leading to a fixed shape when this process is completed. For PP spectra after cocircular excitation and FWM spectra after collinear excitation in general periodic modulations of the shape are superimposed which persist even on long time scales and reflect quantum beats due to the fine structure splitting or the biexciton binding energy.

Item Type: Article
Journal or Publication Title: Physical Review B
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 18694
Deposited By: ep_ss_importer
Deposited On: 28 Oct 2008 13:27
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:20
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/18694

Actions (login required)

View Item