Degenerate orbital effect in a three-orbital periodic Anderson model

Abstract

The competition between the Ruderman-Kittel-Kasuya-Yosida effect and Kondo effect is a central subject of the periodic Anderson model. By using the density matrix embedding theory, we study a three-orbital periodic Anderson model, in which the effects of degenerate conduction orbitals, via the local magnetic moments, number of electrons, and spin-spin correlation functions, are investigated. From the phase diagram at half filling, we find there exist two different antiferromagnetic phases and one paramagnetic phase. To explore the difference between the two antiferromagnetic phases, the topology of the Fermi surface and the connection with the standard periodic Anderson model are considered. The spin-spin correlation functions yield insight into the competition between Ruderman-Kittel-Kasuya-Yosida interaction and Kondo interaction. We further find there exist "scaling transformations," and by applying them to the data with different hybridization strength, all the data collapses. Our calculations agree with previous studies on the standard periodic Anderson model.

Coexistence of Charge Order and Antiferromagnetic Order in an Extended Periodic Anderson Model

“…We [26] It has been applied to the periodic Anderson model. [27,28] In a DMET calculation, a lattice model is mapping to an impurity model. The impurity model only includes a few sites, thus the computational cost is much more reduced.…”