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- Kim, Dai-Sik
- Nano Optics Group
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GIANT EXCITONIC RESONANCE IN TIME-RESOLVED 4-WAVE-MIXING IN QUANTUM-WELLS
- Author(s)
- KIM, DS, SHAH, J, CUNNINGHAM, JE, DAMEN, TC, SCHAFER, W, HARTMANN, M, SCHMITTRINK, S
- Issued Date
- 1992-02
- Citation
- PHYSICAL REVIEW LETTERS, v.68, no.7, pp.1006 - 1009
- Abstract
- We report a strong (300:1) excitonic resonance in time-resolved (100 fs) four-wave mixing in GaAs quantum wells as a function of the incident photon energy and show that it results from the large difference in the dephasing rates of excitons and free carriers. We conclude that excitons dominate even when they make up only a small fraction of the excited states. These results, in conjunction with new results on exciton-phonon scattering, provide new insights into previous studies performed with spectrally broad ultrashort pulses.
- Publisher
- AMER PHYSICAL SOC
- ISSN
- 0031-9007
- Keyword
- HEAVY HOLE EXCITONS, BEATS, GAAS, RELAXATION, LIGHT
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