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

Title data

Krügel, A. ; Vagov, Alexei ; Axt, Vollrath M. ; Kuhn, Tilmann:
Monitoring the buildup of the quantum dot polaron : Pump-probe and four-wave mixing spectra from excitons and biexcitons in semiconductor quantum dots.
In: Physical Review B. Vol. 76 (2007) Issue 19 . - No. 195302, 11 Seiten.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.76.195302

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

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.

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; decoherence; biexcitons; excitons; non-Markovian dynamics; pump-probe
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: 25 Oct 2017 07:42
Last Modified: 25 Oct 2017 07:42
URI: https://eref.uni-bayreuth.de/id/eprint/40160