Subpicosecond time-resolved Raman spectroscopy has been used to measure the lifetime of the LO phonon mode in GaN for photoexcited electron-hole pair density ranging from 10 16 to 2 × 10 19 cm -3. The lifetime has been found to decrease from 2.5 ps, at low density, to 0.35 ps, at the highest density. The experimental findings should help resolve the recent controversy over the lifetime of LO phonon mode in GaN.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)