Size dependence of second-order hyperpolarizability of finite periodic chain under Su-Schrieffer-Heeger model

Shidong Jiang, Minzhong Xu

The second hyperpolarizability ${\gamma }_N(-3\omega \omega ,\omega ,\omega )$ of $N$ double-bond finite chain of trans-polyactylene is analyzed using the Su-Schrieffer-Heeger model to explain qualitative feature…