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- W2023368445 abstract "Third harmonic generation (THG) is used to probe the nonlinear susceptibility (χ(3)) of polyacetylene. The magnitude of χ||(3) (3ω; ω, ω, ω) is (4 ± 2) × 10-10 esu with ℏω = 1.17 eV; the only important component is that associated with π-electron motion along the backbone. Comparison of THG in cis- and trans-(CH)x shows that χ||(3)|trans is 15–20 times larger, implying a mechanism sensitive to the existence of a degenerate ground state. The results are consistent with calculations of χ||(3) based on virtual generation of solitons enabled by nonlinear zero point fluctuations (instantons)." @default.
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- W2023368445 date "1989-01-01" @default.
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- W2023368445 title "Instantons as the origin of the nonlinear optical properties of polyacetylene" @default.
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- W2023368445 doi "https://doi.org/10.1088/0031-8949/1989/t27/025" @default.
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