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- Kim, Dai-Sik
- Nano Optics Group
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Femtosecond four-wave-mixing studies of nearly homogeneously broadened excitons in GaN
- Author(s)
- Fischer, AJ, Shan, W, Park, GH, Song, JJ, Kim, DS, Yee, DS, Horning, R, Goldenberg, B
- Issued Date
- 1997-07
- Citation
- PHYSICAL REVIEW B, v.56, no.3, pp.1077 - 1080
- Abstract
- Femtosecond degenerate four-wave-mixing (FWM) is used to study coherent dynamics of excitons in GaN epilayers. Spectrally resolved (SR) FWM data are dominated by the A and B intrinsic excitonic resonances. SR FWM combined with time-integrated (TI) FWM demonstrates that the excitonic resonances are nearly homogeneously broadened even at low temperature. The temperature-dependent dephasing rate is used to deduce exciton-phonon interaction rates. TI FWM shows a strong beating between the A and B excitons and the beats are shown to be true quantum beats. In addition, a 180 degrees phase shift in the quantum beating was observed when the polarization geometry was changed from collinear to cross linear.
- Publisher
- AMERICAN PHYSICAL SOC
- ISSN
- 1098-0121
- Keyword
- GAAS QUANTUM-WELLS, SPECTROSCOPY, BEATS
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