| Issue |
Europhys. Lett.
Volume 76, Number 4, November 2006
|
|
|---|---|---|
| Page(s) | 670 - 676 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2006-10332-1 | |
| Published online | 20 October 2006 | |
Size dependence of second-order hyperpolarizability of finite periodic chains under Su-Schrieffer-Heeger model
1
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: mx200@nyu.edu
Received:
14
April
2006
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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