Physics – Condensed Matter – Materials Science
Scientific paper
2010-12-16
Phys. Rev. B 84, 035207 (2011)
Physics
Condensed Matter
Materials Science
44 pages, 18 figures. To appear in Physical Review B
Scientific paper
At carrier densities above the Mott density Coulomb screening destroys the exciton resonance. This, together with band-gap renormalization and band filling, severely affects the optical spectra. We have experimentally studied these effects by ultrafast pump-probe reflectivity measurements on a ZnO single crystal at various wavelengths around the exciton resonance and in a broad carrier-density range. Theoretically we determined the Mott density in ZnO to be $1.5\times10^{24}$ m$^{-3}$ at 300 K. Taking a field-theoretical approach, we derived and solved the Bethe-Salpeter ladder equation and we computed the density-dependent reflectivity and absorption spectra. A carrier dynamics model has been developed, containing three-photon absorption, carrier cooling, and carrier trapping near the surface. The agreement between the theoretical reflectivity based on our model and the experimental data is excellent.
Dijkhuis Jaap I.
Kuis Tim
Stoof H. T. C.
Versteegh Marijn A. M.
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