Magnetic effects on the Chern Kondo insulator

Article

关键词: CORRELATED FERMI SYSTEMS;    PERIODIC ANDERSON MODEL;    SLAVE-BOSON APPROACH;    MOTT INSULATOR;    HUBBARD-MODEL;    SMB6;    LATTICE;    SURFACE;    SPIN;    STATES;   

DOI  :  10.1103/PhysRevB.98.125141

来源: SCIE

【 摘 要 】

We examine the Chern Kondo insulator proposed in a square optical lattice with staggered flux induced by s-p orbital hybridization by revisiting its realization and taking into account the magnetic effects for the Kondo phases. The Ruderman-Kittel-Kasuya-Yoshida interaction is analyzed at the weak s-p hybridization regime, with the anisotropic magnetic effects being discussed. Furthermore, the paramagnetic and magnetic phases coexisting with Kondo couplings are systematically investigated through the slave-boson theory, for which the rich effects on the Chern Kondo phase are obtained, including the antiferromagnetic, collinear antiferromagnetic Kondo insulator, and Kondo metal phases. The magnetic orders are shown to enhance the effective Kondo hybridization compared with the case without taking into account magnetic effects, and exhibit different influences on the bulk topology. In particular, the antiferromagnetic ordering always enhances the topological phase by increasing the bulk gap of the Chern Kondo phases. The results show the rich topological and magnetic effects obtained in the present Chern Kondo lattice model. We also investigate how to identify the topology and strong correlation effects through measuring the Hall conductance and double occupancy, which are achievable in ultracold atom experiments.

【 授权许可】

Free