Abstract
Using the Keldysh non-equilibrium Green's function methods we compute analytic expressions over the full frequency range for the nonlinear optical response functions for a non-interacting model of a conducting polymer. The model has no adjustable parameters. Our results for 3rd harmonic generation are in excellent agreement with experiments on polyacetylene. This constitutes strong evidence that polyacetylene is well described by a model of weakly interacting quasi-particles. Further nonlinear optical effects, which should be experimentally observable, are predicted.
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