Optical and spin coherence of excitons in zinc-blende GaN Article - 2009

Christelle Brimont, M. Gallart, O. Cregut, B. Hoenerlage, P. Gilliot, Delphine Lagarde, Andrea Balocchi, Thierry Amand, Xavier Marie, S. Founta, Henri Mariette

Christelle Brimont, M. Gallart, O. Cregut, B. Hoenerlage, P. Gilliot, Delphine Lagarde, Andrea Balocchi, Thierry Amand, Xavier Marie, S. Founta, Henri Mariette, « Optical and spin coherence of excitons in zinc-blende GaN  », Journal of Applied Physics, 2009, p. 053514. ISSN 0021-8979

Abstract

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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