Scattering processes and dynamics of exciton-biexciton system in GaN

被引:3
作者
Adachi, S [1 ]
Hazu, K [1 ]
Sota, T [1 ]
Chichibu, SF [1 ]
Mukai, T [1 ]
Muto, S [1 ]
Suzuki, K [1 ]
机构
[1] Hokkaido Univ, Dept Appl Phys, Kita Ku, Sapporo, Hokkaido 0608628, Japan
来源
ULTRAFAST PHENOMENA IN SEMICONDUCTORS VII | 2003年 / 4992卷
关键词
GaN; biexciton; exciton-exciton correlation; four-wave mixing;
D O I
10.1117/12.475699
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Bound and unbound biexcitons in a free-standing bulk GaN are investigated by time-integrated and spectrally-resolved four-wave mixing measurements, where the formation of hetero-biexcitons that consist of A and B excitons (XXAB) as well as A-biexcitons (XXAA) and their unbound biexciton (XXAA*) are clearly observed. The FWM spectra and delay-time dependence are explained qualitatively and the interaction between A- and B-excitons gives rise to the phase shifts of the quantum beating and the energy shifts of the spectra, which is considered as the effect of the unbound state of XXAB (i.e. XXAB*). The unbound A-biexciton (XXAA*) is also observed clearly in spectral and temporal domain and is found to play an important role in FWM signals for all polarizations.
引用
收藏
页码:188 / 201
页数:14
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