Ribeiro Luiz Antonio, Monteiro Fábio Ferreira, da Cunha Wiliam Ferreira, E Silva Geraldo Magela
Department of Physics, Chemistry and Biology, Linköping University, SE-58183, Linköping, Sweden.
International Center for Condensed Matter Physics, University of Brasília, P.O. Box 04531, 70.919-970, Brasília, DF, Brazil.
Sci Rep. 2018 Apr 26;8(1):6595. doi: 10.1038/s41598-018-24948-1.
The dynamical scattering of two oppositely charged bipolarons in non-degenerate organic semiconducting lattices is numerically investigated in the framework of a one-dimensional tight-biding-Hubbard model that includes lattice relaxation. Our findings show that it is possible for the bipolaron pair to merge into a state composed of a confined soliton-antisoliton pair, which is characterized by the appearance of states within less than 0.1 eV from the Fermi level. This compound is in a narrow analogy to a meson confining a quark-antiquark pair. Interestingly, solitons are quasi-particles theoretically predicted to arise only in polymer lattices with degenerate ground state: in the general case of non-degenerate ground state polymers, isolated solitons are not allowed.
在包含晶格弛豫的一维紧束缚-哈伯德模型框架内，对非简并有机半导体晶格中两个带相反电荷的双极化子的动态散射进行了数值研究。我们的研究结果表明，双极化子对有可能合并成一种由受限孤子-反孤子对组成的状态，其特征是在距费米能级小于0.1 eV的范围内出现态。这种化合物与束缚夸克-反夸克对的介子有微弱的类比关系。有趣的是，孤子是理论上预测仅在具有简并基态的聚合物晶格中出现的准粒子：在非简并基态聚合物的一般情况下，不允许存在孤立孤子。
