Optical Bloch equations with dual photon excitation explain the polarization dependence of four wave mixing quantum beats
✍ Scribed by Wenfeng Wang; Jun Zhang; Daan Lenstra
- Book ID
- 103873347
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 190 KB
- Volume
- 280
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
We explain the polarization dependence of four wave mixing (FWM) quantum beats for semiconductors as essentially due to the spin phase correlations of photo-excited electrons, rather than to Coulomb interaction between the electrons. A theoretical analysis is given within the framework of optical Bloch equations for the light-semiconductor interactions and the Luttinger-Kohn model for the band structure. Residual Coulomb interactions between charge carriers are ignored. The results suggest that the polarization dependence of FWM quantum beats is a purely coherent effect of dual photon excitations, rather than, e.g., exciton-exciton Coulomb interaction. We show that the coherence transfer between the excited states is responsible for the FWM in a configuration with orthogonally polarized pump and probe.