دورية أكاديمية
Ultrafast screening and carrier dynamics in ZnO: Theory and experiment
| العنوان: | Ultrafast screening and carrier dynamics in ZnO: Theory and experiment |
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| المؤلفون: | Versteegh, Marijn A. M., Kuis, Tim, Stoof, H. T. C., Dijkhuis, Jaap I. |
| سنة النشر: | 2010 |
| المجموعة: | ArXiv.org (Cornell University Library) |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Quantum Physics |
| الوصف: | 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. ; Comment: 44 pages, 18 figures. To appear in Physical Review B |
| نوع الوثيقة: | text |
| اللغة: | unknown |
| العلاقة: | http://arxiv.org/abs/1012.3600Test; Phys. Rev. B 84, 035207 (2011) |
| DOI: | 10.1103/PhysRevB.84.035207 |
| الإتاحة: | https://doi.org/10.1103/PhysRevB.84.035207Test http://arxiv.org/abs/1012.3600Test |
| رقم الانضمام: | edsbas.82BF21D1 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1103/PhysRevB.84.035207 |
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