Beat structure in spectrally resolved four-wave mixing under crosslinear polarization in GaAs quantum wells
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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2000
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/6746/ http://irep.iium.edu.my/6746/ http://irep.iium.edu.my/6746/2/physicaE-suryadi-ishihara-ohyama-kadoya-yamanishi.pdf |
| Summary: | 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. |
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