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Article Dans Une Revue Journal of Applied Physics Année : 2009

Optical and spin coherence of excitons in zinc-blende GaN

Résumé

The carrier recombination processes and the relaxation dynamics of spin-polarized excitons in cubic epitaxial GaN have been investigated by time-resolved photoluminescence and pump-probe spectroscopy experiments. We evidence a very fast exciton spin relaxation tau(S)similar to 0.3 ps that is influenced by both the high defect concentration and the strong electron-hole exchange interaction. Spectral oscillatory features of the transient reflectivity are observed for negative delays that allow us to determine the exciton optical dephasing time T-2.
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Dates et versions

hal-00545165 , version 1 (09-12-2010)

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Christelle Brimont, M. Gallart, O. Cregut, B. Hoenerlage, P. Gilliot, et al.. Optical and spin coherence of excitons in zinc-blende GaN. Journal of Applied Physics, 2009, 106, pp.053514. ⟨10.1063/1.3197035⟩. ⟨hal-00545165⟩
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