Controllable chirality and band gap of quantum anomalous Hall insulators

Abstract

Finding guiding principles to optimize properties of quantum anomalous Hall (QAH) insulators is of pivotal importance to fundamental science and applications. Here, we build a first-principles QAH material database of chirality and band gap, explore microscopic mechanisms determining the QAH material properties, and obtain a general physical picture that can comprehensively understand the QAH data. Our results reveal that the usually neglected Coulomb exchange is unexpectedly strong in a large class of QAH materials, which is the key to resolve experimental puzzles. Moreover, we identify simple indicators for property evaluation and suggest material design strategies to control QAH chirality and gap by tuning cooperative or competing contributions via magnetic co-doping, heterostructuring, spin-orbit proximity, etc. The work is valuable to future research of magnetic topological physics and materials.

References in corpus (43)

• Topological Insulators
• Topological insulators and superconductors
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• WannierTools: An open-source software package for novel topological materials
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Wannier90 as a community code: new features and applications
• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Intrinsic quantized anomalous Hall effect in a moiré heterostructure
• Prediction and observation of the first antiferromagnetic topological insulator
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Dilute ferromagnetic semiconductors: Physics and spintronic structures
• Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors
• Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
• Quantum Anomalous Hall Effect in Hg${}_{1-y}$Mn${}_y$Te Quantum Wells
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• Quantum anomalous Hall effect from intertwined moiré bands
• Quantum Anomalous Hall Effect in Graphene Proximity Coupled to an Antiferromagnetic Insulator
• Z2Pack: Numerical Implementation of Hybrid Wannier Centers for Identifying Topological Materials
• High-Chern-Number and High-Temperature Quantum Hall Effect without Landau Levels
• Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
• Gapless surface Dirac cone in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
• Prediction of Near-Room-Temperature Quantum Anomalous Hall Effect on Honeycomb Materials
• Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1
• Half-metallic semiDirac point generated by quantum confinement in TiO${}_2$/VO${}_2$ nanostructures
• Topological delocalization of two-dimensional massless Dirac fermions
• Highly-ordered wide bandgap materials for quantized anomalous Hall and magnetoelectric effects
• NiCl3 Monolayer: Dirac Spin-Gapless Semiconductor and Chern Insulator
• Observation of high-temperature quantum anomalous Hall regime in intrinsic MnBi${}_2$Te${}_4$/Bi${}_2$Te${}_3$ superlattice
• Quantum anomalous Hall effect in ferromagnetic transition metal halides
• Exchange Bias and Quantum Anomalous Hall Effect in the MnBi2Te4-CrI3 Heterostructure
• Correlation-driven topological phase transition from in-plane magnetized quantum anomalous Hall to Mott insulating phase in monolayer transition metal trichlorides
• Chern insulators from heavy atoms on magnetic substrates
• High-Temperature Quantum Anomalous Hall Insulators in Lithium-Decorated Iron-Based Superconductor Materials
• Magnetize Topological Surface States of Bi2Se3 with a CrI3 Monolayer
• Emergent topological and half semimetallic Dirac Fermions at oxide interfaces
• Emergence of a Chern-insulating state from a semi-Dirac dispersion
• Magnetic imaging of antiferromagnetic domain walls
• Magnetic-field-induced robust zero Hall plateau state in MnBi${}_2$Te${}_4$ Chern insulator
• Tunable interlayer magnetism and band topology in van der Waals heterostructures of MnBi2Te4-family materials
• Quantum anomalous Hall effect in two-dimensional magnetic insulator heterojunctions

Cited by in corpus (4)

• On the topological surface states of the intrinsic magnetic topological insulator Mn-Bi-Te family
• Multimechanism quantum anomalous Hall and Chern number tunable states in germanene (silicene, stanene)/$M$Bi${}_2$Te${}_4$ heterostructures
• Universally optimizable strategy for magnetic gaps towards high-temperature quantum anomalous Hall states via magnetic-insulator/topological-insulator building-blocks
• Tunable Majorana corner states driven by superconducting phase bias in a vertical Josephson junction