Chiral channel network from magnetization textures in 2D MnBi2Te4

Abstract

When atomically thin van der Waals (vdW) magnet forms long-period moiré pattern with a magnetic substrate, the sensitive dependence of interlayer magnetic coupling on the atomic registries can lead to moiré defined magnetization textures in the two-dimensional (2D) magnets. The recent discovery of 2D magnetic topological insulators such as MnBi2Te4 leads to the interesting possibility to explore the interplay of such magnetization textures with the topological surface states, which we explore here with a minimal model established for 2D MnBi2Te4. The sign flip of the exchange gap across a magnetization domain wall gives rise to a single in-gap chiral channel on each surface. In the periodic magnetization textures, such chiral spin channels at the domain walls couple to form a network and superlattice minibands emerge. We find that in magnetization textures with closed domain wall geometries, the formed superlattice miniband is a gapped Dirac cone featuring orbital magnetization from the current circulation in the close loops of chiral channels, while in magnetization textures with open domain wall geometries, gapless mini-Dirac cone is found instead. The miniband Bloch states feature a spatial texture of spin and local current density, which are clear manifestation of the spin-momentum locked chiral channels at the domain walls. The results suggest a new platform to engineer spin and current flows through the manipulation of magnetization domains for spintronic devices.

arXiv comment10 pages, 7 figures

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• Fusion of Majorana Bound States with Mini-Gate Control in Two-Dimensional Systems
• Topological response of the anomalous Hall effect in MnBi2Te4 due to magnetic canting
• Dissipationless Layertronics in Axion Insulator $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$
• Emergent Energy Dissipation in Quantum Limit
• Layer Zero-Line Modes in Antiferromagnetic Topological Insulators
• Two-dimensional Dirac fermions in a mass superlattice
• Topological superconductivity in a magnetic-texture coupled Josephson junction
• Hall-effect in the MnBi_2Te_4 crystal using silicon nitride nanomembrane via contacts
• Magnetic Moiré Systems: a review
• Topological phase transition from periodic edge states in moiré superlattices
• Chiral electronic network within skyrmionic lattice on topological insulator surfaces