Tunable Massive Dirac Fermions in Ferromagnetic Fe<sub>3</sub>Sn<sub>2</sub> Kagome Lattice
Zheng‐Zhe Lin, Xi Chen
Abstract
Kagome lattice is known to host Dirac electrons with exotic quantum magnetic states, which can lead to topological and Chern insulating phases. A recent experiment has found that Fe 3 Sn 2 kagome lattice supports massive Dirac fermions in the presence of ferromagnetic order. Herein, the origin of the effective mass of Dirac electrons in Fe 3 Sn 2 is theoretically interpreted. By investigating the formation mechanism of spin‐polarized Dirac states, the relation of spin–orbit coupling (SOC) and effective mass are clarified. On this basis, a method to control the effective mass of Dirac electrons is proposed. The results reveal the origin of new phenomenon in spin‐polarized Dirac quantum systems with time‐reversal symmetry breaking. The study on the modulation of Dirac electrons provides insight into a modulation mechanism based on SOC and guidance to the miniaturization of high‐mobility electronic and spintronic devices.