The periodic Anderson lattice model for the crystalline electric field (CEF)split 4f quartet states is used to describe the Yb-based Kondo insulators/semiconductors. In the slave-boson mean-field approximation, we derive the hybridized quasiparticle bands, and find that decreasing the hybridization difference of the two CEF quartets may induce an insulator-to-metal phase transition. The resulting metallic phase has a hole and an electron Fermi pockets. Such a phase transition may be realized experimentally by applying pressure, reducing the difference in hybridization of the two CEF quartets.
@article{arxiv.1004.3834,
title = {Insulator-to-metal phase transition in Yb-based Kondo insulators},
author = {Guang-Bin Li and Guang-Ming Zhang and Lu Yu},
journal= {arXiv preprint arXiv:1004.3834},
year = {2015}
}