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Even Parity States in Ppv, Polythiophene and Polysilanes

Published online by Cambridge University Press:  16 February 2011

F. Guo ,
M. Chandross  and
S. Mazumdar
F. Guo
Affiliation:
University of Arizona, Department of Physics, Tucson, AZ 8572
M. Chandross
Affiliation:
University of Arizona, Department of Physics, Tucson, AZ 8572
S. Mazumdar
Affiliation:
University of Arizona, Department of Physics, Tucson, AZ 8572
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Abstract

Two photon absorptions (TPA) in conjugated polymers with large bond alternation are reinterpreted. TPA to the 2A g in long chains should be tiny due to cancellation effects, and therefore the observed strong, narrow TPA is to a higher even parity state. We also present the first theoretical evidence for bound biexcitons, and explain recent photoinduced absorption data.

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References

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