Physics – Condensed Matter – Materials Science
Scientific paper
2003-02-14
Physical Review B 68, 165325 (2003)
Physics
Condensed Matter
Materials Science
8 figures
Scientific paper
10.1103/PhysRevB.68.165325
Femtosecond pump-probe (PP) differential reflectivity spectroscopy (DRS) and four-wave mixing (FWM) experiments were performed simultaneously to study the initial temporal dynamics of the exciton line-shapes in GaN epilayers. Beats between the A-B excitons were found \textit{only for positive time delay} in both PP and FWM experiments. The rise time at negative time delay for the differential reflection spectra was much slower than the FWM signal or PP differential transmission spectroscopy (DTS) at the exciton resonance. A numerical solution of a six band semiconductor Bloch equation model including nonlinearities at the Hartree-Fock level shows that this slow rise in the DRS results from excitation induced dephasing (EID), that is, the strong density dependence of the dephasing time which changes with the laser excitation energy.
Fischer John A.
Jho Y.-D.
Kenrow J.
Kim Dae San
Sayed K. El
No associations
LandOfFree
Exceptionally Slow Rise in Differential Reflectivity Spectra of Excitons in GaN: Effect of Excitation-induced Dephasing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Exceptionally Slow Rise in Differential Reflectivity Spectra of Excitons in GaN: Effect of Excitation-induced Dephasing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exceptionally Slow Rise in Differential Reflectivity Spectra of Excitons in GaN: Effect of Excitation-induced Dephasing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-267095