Second harmonic generation by charge-transfer excitons interacting with phonons
Effects of exciton-phonon interaction on the nonlinear optical response of charge-transfer excitons (CTE) are studied in the framework of an exactly solvable model. It is found that the second order excitonic optical polarizability {beta} is modified due to the CTE-phonon interaction. For a nonresonant frequency range, where {beta} is relatively small, the change is not significant. On the contrary, in the vicinity of resonances (when the light frequency {omega}{approximately}{omega}{sub 0} or {omega}{approximately}{omega}{sub 0}/2, {omega}{sub 0} is the CTE transition frequency), the CTE-phonon interaction may remarkably diminish the value of {beta}. This should be taken into account when considering CTE systems in nonlinear optics.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40203547
- Journal Information:
- Physical Review B, Vol. 63, Issue 23; Other Information: DOI: 10.1103/PhysRevB.63.233101; Othernumber: PRBMDO000063000023233101000001; 001115PRB; PBD: 15 Jun 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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