Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-11-02
Phys. stat. sol. B 245, 1093 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 2 figures, RevTex4, changes: as published
Scientific paper
10.1002/pssb.200777627
We investigate the absorption and emission of a 25 nm ZnSe layer, which was grown on a GaAs buffer and cladded by ZnSSe layers. Due to the coupling of light with the exciton resonances, polariton modes propagate through the ZnSe layer. Their interferences appear as additional peaks in the reflection spectra and can be explained by the effect of spatial dispersion. We present additional experimental results for the emission of the sample after excitation by a pump pulse, showing corresponding interference peaks of the polariton modes, whose maxima strongly decrease to higher energies. Our exact theoretical analysis shows that the ratio of emission and absorption is given by the population of the globally defined states of the electromagnetic field, i.e. the polariton distribution which is generated by the pump pulse. This distribution, being far from thermal quasiequilibrium, shows pronounced peaks at the polariton modes depending on the energy of the pump pulse.
Florian Matthias
Henneberger Klaus
Hommel Detlef
Kieseling Frank
Manzke G.
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