Hot carrier relaxation in GaN : LO phonon scattering and excitonic effects

Hot carrier relaxation has been studied in GaN using femtosecond time-resolved optical transmission and reflection. A non-thermal electron distribution with a pronounced "cut-off" at E-LO is observed for up to similar to 3 ps after photoexcitation. Monte Carlo simulations show that this be...

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Bibliographic Details
Main Authors: O'Sullivan, E, Hess, S, Taylor, R, Cain, N, Roberts, V, Roberts, J, Ryan, J
Format: Conference item
Published: 1999
Description
Summary:Hot carrier relaxation has been studied in GaN using femtosecond time-resolved optical transmission and reflection. A non-thermal electron distribution with a pronounced "cut-off" at E-LO is observed for up to similar to 3 ps after photoexcitation. Monte Carlo simulations show that this behaviour is due to a remarkably strong electron-LO phonon interaction. Excitonic effects are also pronounced and strongly influence the dynamics. (C) 1999 Published by Elsevier Science B.V. All rights reserved.