Magnetization-Tunable Topological Phase Transitions in Ferromagnetic Kagome Monolayers of Co${}_3$X${}_3$Y${}_2$ ($X=\mathrm{Sn},\mathrm{Pb}$; $Y=\mathrm{S},\mathrm{Se}$)

Abstract

The quantum anomalous Hall effect in magnetic kagome materials has emerged as a versatile platform for dissipationless electronic and spintronic devices. In this work, we demonstrate that the orientation of magnetic moments $\hat{m}(\theta ,\varphi )$ at lattice sites provides a practical tuning mechanism for engineering nontrivial topological phases in monolayer kagome ferromagnets. To elucidate the mechanism, we construct a symmetry-adapted minimal tight-binding model for kagome ferromagnets that includes intrinsic spin-orbit coupling (SOC) and the intrinsic Rashba SOC permitted by broken out-of-plane mirror symmetry between nearest-neighbor kagome sites and can capture the resulting topological phase diagram as a function of $\hat{m}(\theta ,\varphi )$. In particular, the restoration of in-plane mirror symmetry for specific values of $\varphi$ drives a topological phase transition upon varying the in-plane orientation of the moments $\hat{m}(\theta =90^{\circ },\varphi )$. In contrast, for fixed $\varphi$, the transitions driven by varying $\theta$ originate from the competition between Rashba SOC and intrinsic SOC. Density functional theory calculations for ferromagnetic kagome monolayers belonging to the Co${}_3$X${}_3$Y${}_2$ family ($X=\mathrm{Sn},\mathrm{Pb}$; $Y=\mathrm{S},\mathrm{Se}$) support the predictions of the proposed minimal tight-binding model. These findings provide design guidelines for tunable topological phases in kagome materials.

8 pages, 6 figures

References in corpus (29)

• Topological Insulators
• Quantum Spin Hall Effect in Graphene
• Berry Phase Effects on Electronic Properties
• Maximally localized Wannier functions: Theory and applications
• WannierTools: An open-source software package for novel topological materials
• Wannier90 as a community code: new features and applications
• Low-energy effective Hamiltonian involving spin-orbit coupling in Silicene and Two-Dimensional Germanium and Tin
• Anomalous Hall effect arising from noncollinear antiferromagnetism
• Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects
• Spin Anisotropy and Quantum Hall Effect in the Kagome Lattice - Chiral Spin State based on a Ferromagnet-
• Topological kagome magnets and superconductors
• Flat Chern Band in a Two-Dimensional Organometallic Framework
• In-plane Magnetization Induced Quantum Anomalous Hall Effect
• Chern Number Tunable Quantum Anomalous Hall Effect in Monolayer Transitional Metal Oxides via Manipulating Magnetization Orientation
• Topological states on the breathing kagome lattice
• Correlation-driven topological phase transition from in-plane magnetized quantum anomalous Hall to Mott insulating phase in monolayer transition metal trichlorides
• Two-Dimensional Room Temperature Ferromagnetic Semiconductors with Quantum Anomalous Hall Effect
• Creating Weyl nodes and controlling their energy by magnetization rotation
• Emerging chiral edge states from the confinement of a magnetic Weyl semimetal in Co${}_3$Sn${}_2$S${}_2$
• Topological Quantum Materials with Kagome Lattice
• Quantum anomalous Hall effect in atomic crystal layers from in-plane magnetization
• Kagome quantum anomalous Hall effect with high Chern number and large band gap
• Quantized Anomalous Hall Insulator in a Nanopatterned Two-Dimensional Electron Gas
• Tilted Dirac cones and topological transitions in strained kagome lattices
• Magnetic orderings from spin-orbit coupled electrons on kagome lattice
• Tuning the electronic band structure in a kagome ferromagnetic metal via magnetization
• Topological transitions by magnetization rotation in kagome monolayers of ferromagnetic Weyl semimetal Co-based shandite
• Effective model analysis of intrinsic spin Hall effect with magnetism in stacked-kagome Weyl semimetal Co3Sn2S2
• In-plane magnetization orientation driven topological phase transition in OsCl${}_3$ monolayer