標題: Bond length order parameter of conjugated polymers
作者: Lai, CM
Meng, HF
物理研究所
Institute of Physics
關鍵字: conjugated polymers;solitons;polarons
公開日期: 1-十一月-1999
摘要: It is usually assumed that the ground state lattice configuration of polyacetylene is a dimerized chain. We found that the energy can be further reduced by an overall chain length contraction, which leads to a new bond length order parameter, in addition to the well-known bond alternation order parameter. For quasi-particles like solitons and polarons, these two order parameters are coupled with the electron wave functions and vary in space. We generalize the Takayama-Liu-Maki equations in the continuum limit to incorporate this new order parameter. Significant modifications are found for the polaron solution. Polyacene, a ladder polymer, is also studied with the inclusion of the bond length order parameter. The ground state is predicted to be a non-alternating structure, with zero energy gap and unusually high electric conductivity. (C) 1999 Elsevier Science B.V. All rights reserved.
URI: http://hdl.handle.net/11536/30996
ISSN: 0921-4526
期刊: PHYSICA B
Volume: 271
Issue: 1-4
起始頁: 332
結束頁: 342
顯示於類別:期刊論文


文件中的檔案:

  1. 000084152100037.pdf