Bound and unbound biexcitons in a free-standing bulk GaN are investigated by time-integrated and spectrallyresolved 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 (XX AA) 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. XX AB). The unbound A-biexciton (XX AA) is also observed clearly in spectral and temporal domain and is found to play an important role in FWM signals for all polarizations.
|ジャーナル||Proceedings of SPIE - The International Society for Optical Engineering|
|出版ステータス||Published - 2003 5月 30|
|イベント||Ultrafast Phenomena in Semiconductors VII 2003 - San Jose, United States|
継続期間: 2003 1月 25 → 2003 1月 31
ASJC Scopus subject areas
- コンピュータ サイエンスの応用