GIANT EXCITONIC RESONANCE IN TIME-RESOLVED 4-WAVE-MIXING IN QUANTUM-WELLS

被引：119
作者：
KIM, DS
SHAH, J
CUNNINGHAM, JE
DAMEN, TC
SCHAFER, W
HARTMANN, M
SCHMITTRINK, S
机构：
[1] FORSCHUNGSZENTRUM JULICH, HOCHSTLEISTUNGSRECHENZENTRUM, W-5170 JULICH 1, GERMANY
[2] UNIV MARBURG, DEPT PHYS, W-3550 MARBURG, GERMANY
[3] UNIV MARBURG, CTR MAT SCI, W-3550 MARBURG, GERMANY
来源：
PHYSICAL REVIEW LETTERS | 1992年 / 68卷 / 07期
关键词：
D O I：
10.1103/PhysRevLett.68.1006
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页码：1006 / 1009
页数：4
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