Femtosecond pump-probe spectroscopy of a highly excited GaN epilayer

Chan-Kyung Choi; Yong Hwang Kwon; Jerzy S. Krasinski; Gil-Han Park; Girish Setlur; Jin-Joo Song; Yia-Chung Chang

doi:10.1117/12.424723

23 April 2001 Femtosecond pump-probe spectroscopy of a highly excited GaN epilayer

Chan-Kyung Choi, Yong Hwang Kwon, Jerzy S. Krasinski, Gil-Han Park, Girish Setlur, Jin-Joo Song, Yia-Chung Chang

Proceedings Volume 4280, Ultrafast Phenomena in Semiconductors V; (2001) https://doi.org/10.1117/12.424723
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

The non-equilibrium carrier dynamics in GaN epilayer for carrier densities ranging from 4 X 10¹⁷ to 10¹⁹ cm^-3 at 10 K was studied by femtosecond pump-probe transmission spectroscopy. Spectral hole burning was initially peaked roughly at the excitation energy for an estimated carrier density of 4 X 10¹⁸ cm^-3 and gradually redshifted during the excitation. Because of reduced carrier-carrier and carrier-phonon scattering, a very slow energy relaxation of the hot carriers at these densities were observed. We show that the hot carriers were strongly confined in a non-thermal distribution and they relaxed collectively to the band edge.

Citation Download Citation

Chan-Kyung Choi, Yong Hwang Kwon, Jerzy S. Krasinski, Gil-Han Park, Girish Setlur, Jin-Joo Song, and Yia-Chung Chang "Femtosecond pump-probe spectroscopy of a highly excited GaN epilayer", Proc. SPIE 4280, Ultrafast Phenomena in Semiconductors V, (23 April 2001); https://doi.org/10.1117/12.424723

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