Dynamical model of the dielectric screening of conjugated polymers

被引：9

作者：

Barford, W ^{[1
]}

Bursill, RJ

Yaron, D

机构：

[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[2] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[3] Carnegie Mellon Univ, Dept Chem, Pittsburgh, PA 15213 USA

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 15期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.69.155203

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A dynamical model of the dielectric screening of conjugated polymers is introduced and solved using the density-matrix renormalization group method. The model consists of a line of quantized dipoles interacting with a polymer chain. The polymer is modeled by the Pariser-Parr-Pople model. It is found that (1) compared to isolated, unscreened single chains, the screened 1(1)B(u)(-) exciton binding energy is typically reduced by ca. 1 eV to just over 1 eV. (2) Covalent (magnon and bimagnon) states are very weakly screened compared to ionic (exciton) states. (3) Screening of the 1(1)B(u)(-) exciton is closer to the dispersion than the solvation limit.

引用

页码：155203 / 1

页数：5

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