Volume 76, Number 4, November 2006
|Page(s)||670 - 676|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||20 October 2006|
Size dependence of second-order hyperpolarizability of finite periodic chains under Su-Schrieffer-Heeger model
Department of Mathematical Sciences, New Jersey Institute of Technology Newark, NJ 07102, USA
2 Department of Chemistry, New York University - New York, NY 10003, USA
Corresponding author: email@example.com
Accepted: 29 September 2006
The second hyperpolarizability of N double-bond finite chain of trans-polyacetylene is analyzed using the Su-Schrieffer-Heeger model to explain qualitative features of the size dependence behavior of . Our study shows that is nonmonotonic with N and that the nonmonotonicity is caused by the dominant contribution of the intraband transition to in polyenes. Several important physical effects are discussed to reduce quantitative discrepancies between experimental and our results.
PACS: 78.66.Qn – Polymers; organic compounds / 42.65.An – Optical susceptibility, hyperpolarizability / 78.20.Bh – Theory, models, and numerical simulation
© EDP Sciences, 2006
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