论文标题
1d半磁性哈伯德模型中的局部激子
Localized excitons in 1D half-filled paramagnetic Hubbard model
论文作者
论文摘要
以哈伯德模型的示例，我们通过分析和数值检查局部电子 - 电子对（Doubleons）和局部电子孔对（Frenkel-型型激子）的构造和共存。在这里，我们证明，在现场库仑排斥u的变化下，发生了从doublon到激子制度的量子过渡，该级别由价值低的有效杂交和电导率子带的有效杂交来调节。我们计算不同U的动量分布函数和电子频谱函数，这些功能在费米水平上揭示了拓扑上的非平凡行为。
By the example of the Hubbard model we analytically and numerically examine the formating and coexisting of localized electron--electron pairs (doublons) and localized electron--hole pairs (Frenkel--type excitons) . Here we demonstrate that at a variation of the on-site Coulomb repulsion U there occurs a quantum transition from the doublon to the exciton regime that is conditioned by the low-energy effective hybridization of the valence and conductivity subbands. We calculate momentum distribution functions and electronic spectrum functions for different U, which reveal topologically nontrivial behaviour at the Fermi level.
