标题： 孤子晶格系统中激子的非线性光学响应 显示英文标题

标题： Nonlinear optical response from excitons in soliton lattice systems

摘要： 激子效应对共轭聚合物以及由此产生的光学非线性在孤子晶格系统中进行了研究。 在10%掺杂情况下，三阶光谐波的幅度比中性系统的幅度增加了约10^2倍。 增加两个数量级的现象对于几种库仑相互作用强度的选择是普遍的，并且在开放系统和周期性系统中都能观察到。 我们还发现，当开放边界条件下的孤子数目为两个时，三阶光谐波显著增强。 这一新现象应该对实验工作者具有吸引力。 关键词：半经验模型和模型计算，电子密度和激发谱计算，多体和准粒子理论，低带隙共轭聚合物 显示英文摘要

摘要： Exciton effects on conjugated polymers and the resulting optical nonlinearities are investigated in soliton lattice systems. The magnitude of the THG at the 10 percent doping increases by the factor about 10^2 from that of the neutral system. The huge increase by the order two is common for several choices of Coulomb interaction strengths, and is seen in open systems as well as in periodic systems. We also find that the THG enhances much larger when the number of solitons is two in the open boundaries. This new fact should be attractive to the experimentalists. Keywords: Semi-empirical models and model calculations, Electron density and excitation spectra calculations, Many-body and quasiparticle theories, Low-bandgap conjugated polymers