Open AccessELECTRON ELECTRON INTERACTION AND SOLITON EXCITATION(Ⅰ)——THE EFFECT OF ELECTRON CORRELATION ON THE LOCALIZATION OF SOLITON
Author(s) -
Yunsheng Ma,
Wu Chang-Qin,
Xingming Sun,
Ruigang Fu,
Ruigang Fu,
Junhao Zhu
Publication year - 1997
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.46.353
Subject(s) - electron , physics , coulomb , soliton , excitation , electronic correlation , hubbard model , condensed matter physics , atomic physics , quantum mechanics , nonlinear system , superconductivity
The effect of electron-electron interaction on the localization of soliton is studied. Because the conducting polymer possesses wide bandwidth, the Hubbard model is no longer a suitable approximation. It is needed to use a screened Coulomb potential to describe the e-e interaction. Our theory shows that the screening plays a key role in the effect of e-e interaction on the localization of soliton: in weak screening, the localization of soliton will be enhanced by the e-e interaction; in strong screening, it will be reduced. In the end, the physical reason of above-mentioned results is explained by analysing the relation between screening and electron correlation.