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Proceedings Paper

Studies of longitudinal optical phonons in GaN by subpicosecond time-resolved Raman spectroscopy
Author(s): K. T. Tsen; Juliann G. Kiang; D. K. Ferry; H. Morkoç
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Paper Abstract

The lifetime of longitudinal optical phonon mode in GaN has been measured by subpicosecond time-resolved Raman spectroscopy for photoexcited electron-hole pair density ranging from 1016 cm-3 to 2x1019cm-3 and at T = 300K. The lifetime has been found to decrease from 2.5 ps, at the lowest density to 0.35 ps, at the highest density. Possible mechanism for this observation has been discussed. Our experimental findings help resolve the recent controversy over the lifetime of LO phonon mode in GaN.

Paper Details

Date Published: 8 February 2007
PDF: 10 pages
Proc. SPIE 6471, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV, 64710X (8 February 2007); doi: 10.1117/12.703696
Show Author Affiliations
K. T. Tsen, Arizona State Univ. (United States)
Juliann G. Kiang, Uniformed Services Univ. of the Health Sciences (United States)
D. K. Ferry, Arizona State Univ. (United States)
H. Morkoç, Virginia Commonwealth Univ. (United States)


Published in SPIE Proceedings Vol. 6471:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV
Marshall J. Cohen; Kong-Thon Tsen; Joseph P. Estrera; Jin-Joo Song, Editor(s)

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