Beat structure in spectrally resolved four-wave mixing under crosslinear polarization in GaAs quantum wells

• Main Authors: -, Suryadi, Ishihara, T., Ohyama, H., Kadoya, Y., Yamanishi, M.
• Format: Article
• Language: English
• Published: Elsevier 2000
• Subjects: QC Physics
• Online Access: http://irep.iium.edu.my/6746/2/physicaE-suryadi-ishihara-ohyama-kadoya-yamanishi.pdf; http://irep.iium.edu.my/6746/; http://www.sciencedirect.com/science/article/pii/S1386947799003860

The polarization dependence of beat structure in spectrally resolved four-wave mixing was investigated on GaAs multiple quantum wells. Under crosslinear polarization we observed a beating structure at higher energy region of the main spectral peak due to biexciton–exciton transition. The beat has a period of 0.95 ps and is constructive at delay time , which suggests the corresponding double Feynman diagrams to be of the same type. By shortening the central wavelength of the sub-ps laser, we observed the distinctive peak corresponding to the beat period. Even in GaAs system, which is generally believed to have a small biexcitonic effect, there are two effective 2-exciton states with well-defined energies which are required to describe the third-order optical nonlinearly.