Spectral Functions of the Falicov-Kimball Model with Electronic Ferroelectricity

Authors

• Wei-Guo Yin, University of Nebraska, Omaha, Nebraska
• Wai-Ning Mei, University of Nebraska at OmahaFollow
• Chun-Gang Duan, University of Nebraska at OmahaFollow
• Hai-Qing Lin, The Chinese University of Hong Kong, Hong Kong, People’s Republic of China
• John R. Hardy, University of Nebraska - LincolnFollow

Document Type

Article

Date of this Version

2003

Comments

Published in Phys. Rev. B 68, 075111 (2003). Copyright © 2003 The American Physical Society. Used by permission.

Abstract

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.