Observation of flat band, RKKY plateau, and magnetization jump in quasi-one-dimensional triangular kagome lattice model

Abstract

Inspired by the research interest on the realization of flatbands and magnetization plateaus in kagome lattices, herein we study the electronic properties and exchange magnetic interactions in quasi-one-dimensional boron triangular kagome lattice (1D-BTKL) models by using the real-space Green’s function approach in a tight-binding model. First, we study the electronic properties of 1D-BTKLs in the presence of staggered sublattice potential, and then, by analyzing the Ruderman–Kittel–Kasuya–Yoshida (RKKY) interaction in these lattice structures, the magnetic ground states of 1D-BTKLs in the presence of two magnetic adatoms are evaluated. It is found that the 1D channels of BTKL show different electronic and magnetic behaviors due to different values of the hopping integrals and spin–orbit couplings. Two important salient features of 1D-BTKLs are the presence of flatbands in their band structures as well as the emergence of the RKKY plateau vs the Fermi energy. To the best of our knowledge, it is the first time that the RKKY plateau is systematically reported and as we will see this idea has been advocated forcefully. It was shown that both the width and location of the magnetization plateaus could be controlled through variation of the staggered potential and the Fermi energy as well as the spatial configuration of the magnetic impurities, enabling a variety of electromagnetic devices to be produced. The other fascinating feature of the present study is the magnetic susceptibility discontinuity, named as magnetization jump, which accompanies with the discontinuity in the magnetization curves. We believe that our results provide significant insights into designing further experiments to search for the realization of the flatbands and magnetization plateau phases in spintronics and pseudospin electronic devices based on TKLs.