We calculate the angular resolved photoemission spectrum of the Falicov-Kimball model with electronic ferroelectricity where d- and f-electrons have different hoppings. In mix-valence regimes, the presence of strong scattering processes between d – f excitons and a hole, created by emission of an electron, leads to the formation of pseudospin polarons and novel electronic structures with bandwidth scaling with that of d – f excitons. Especially, in the two-dimensional case, we find that flat regions exist near the bottom of the quasiparticle band in a wide range of the d- and f-level energy difference.
Yin, Wei-Guo; Mei, Wai-Ning; Duan, Chun-Gang; Lin, Hai-Qing; and Hardy, John R., "Spectral Functions of the Falicov-Kimball Model with Electronic Ferroelectricity" (2003). Physics Faculty Publications. 14.