The Genkin-Mednis is usually used to calculate the nonlinear optical properties of periodic polymers or crystals, the analytical derivation is captured in the posted image,(adsbygoogle = window.adsbygoogle || []).push({});

My problem is (483), where does an extra term on the right hand side of (483)

come from? [tex] ie S^\dagger (\kappa t)\nabla_{\kappa} S^\dagger (\kappa t) E(t)[/tex]

My derivation is simple:

left multiplying [tex] S^\dagger[/tex] in the last equation in page 197

Then we can derive (483) but without the extra term [tex] ie S^\dagger (\kappa t)\nabla_{\kappa} S^\dagger (\kappa t) E(t)[/tex], Who can give me a hint, why the extra term appears?

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# A Genkin-Mednis Method? An extra term -- why?

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