Two Dimensional Antiferromagnetic Chern Insulator NiRuCl6

Abstract

Based on DFT and Berry curvature calculations, we predict that quantum anomalous hall effect (QAHE) can be realized in two dimensional anti-ferromagnetic (AFM) NiRuCl6 with zero net magnetic moment. By tuning spin-orbits coupling (SOC), we find that the topological properties of NiRuCl6 come from its energy band reversal. The results indicate that NiRuCl6 behaves as AFM Chern insulator and its spin-polarized electronic structure and strong spin-orbits coupling (SOC) are the origin of QAHE. Considering the compatibility between AFM and insulator, AFM Chern insulator is more suitable to realize high temperature QAHE because generally Neel temperature of AFM systems is more easily improved than Curie temperature of ferromagnetic (FM) systems. Due to the different magnetic coupling mechanism between FM and AFM Chern insulator, AFM Chern insulator provides a new way to archive high temperature QAHE in experiments.

6 pages, 6 figures

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• Prediction of High Temperature Quantum Anomalous Hall Effect in Two Dimensional Transition-Metal Oxides
• Antiferromagnetic Chern insulators in non-centrosymmetric systems
• Computational Search for Magnetic and Non-magnetic 2D Topological Materials using Unified Spin-orbit Spillage Screening
• Spin-Orientation Dependent Topological States in Two-Dimensional Antiferromagnetic NiTl${}_2$S${}_4$ Monolayers
• Chern-insulator phase in antiferromagnets
• Chern Number Tunable Quantum Anomalous Hall Effect in Compensated Antiferromagnets
• Time-reversal-breaking topological phases in antiferromagnetic Sr${}_2$FeOsO${}_6$ films
• Antiferromagnetic Chern insulator in centrosymmetric systems
• First-principles study on the bulk and two-dimensional structures of AMnBi(A =K, Rb, Cs)-family materials
• Light-induced Odd-parity Magnetism in Conventional Collinear Antiferromagnets
• Topological antiferromagnetic spintronics: Part of a collection of reviews on antiferromagnetic spintronics
• Symmetry breaking and unconventional charge ordering in single crystal Na${}_{2.7}$Ru${}_4$O${}_9$