The excitonic optical Stark effect in GaN

被引：0
|
作者：
Choi, CK [1 ]
Chang, YC [1 ]
Lam, JB [1 ]
Shee, SK [1 ]
Krasinski, JS [1 ]
Song, JJ [1 ]
机构：
[1] Oklahoma State Univ, Ctr Laser & Photon Res, Stillwater, OK 74078 USA
来源：
ULTRAFAST PHENOMENA IN SEMICONDUCTORS VI | 2002年 / 4643卷
关键词：
Stark effect; GaN; pump-probe; polarization dependence;
D O I：
10.1117/12.470414
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We report experimental and theoretical studies of the excitonic optical Stark effect in GaN photoexcited below the excitonic resonances with various polarization configurations and pump detunings, using nondegenerate pump-probe spectroscopy at 10 K. We observed that the Stark effect in GaN is strongly dependent on pump and probe relative linear polarizations. We found that this dependence results from the small spin-orbit splitting in GaN and a mixing of A and B valence bands induced by a linearly polarized pump. Using two different circular polarization configurations, we also observed splitting of degenerate excitons because of different optical Stark shifts. Our experimental results are explained by a simple theoretical model.
引用
收藏
页码：139 / 147
页数：9
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