Towards the Quantized Anomalous Hall effect in AlO${}_x$-capped MnBi${}_2$Te${}_4$

Abstract

The quantum anomalous Hall effect in layered antiferromagnet MnBi${}_2$Te${}_4$ harbors a rich interplay between magnetism and topology, holding a significant promise for low-power electronic devices and topological antiferromagnetic spintronics. In recent years, MnBi${}_2$Te${}_4$ has garnered considerable attention as the only known material to exhibit the antiferromagnetic quantum anomalous Hall effect. However, this field faces significant challenges as realizing quantized transport at zero magnetic fields depends critically on fabricating high-quality device. In this article, we address the detrimental influences of fabrication on MnBi${}_2$Te${}_4$ by simply depositing an AlO${}_x$ thin layer on the surface prior to fabrications. Optical contrast and magnetotransport measurements on over 50 samples demonstrate that AlO${}_x$ can effectively preserve the pristine state of the samples and significantly enhance the anomalous Hall effect towards quantization. Scaling analysis reveals the Berry curvature dominated mechanism of the anomalous Hall effect at various magnetic configurations. By adjusting the gate voltage, we uncover a gate independent antiferromagnetism in MnBi${}_2$Te${}_4$. Our experiment not only pave the way for fabricating high-quality transport devices but also advance the exploration of exotic quantum physics in 2D materials.

21 pages, 4 figures

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• Antiferromagnetic Quantum Anomalous Hall Effect Modulated by Spin Flips and Flops
• Chern Number Tunable Quantum Anomalous Hall Effect in Compensated Antiferromagnets
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Tailoring Neel orders in Layered Topological Antiferromagnets
• Strongly enhanced topological quantum phases in dual-surface AlO${}_x$-encapsulated MnBi${}_2$Te${}_4$
• Chromium chalcohalide Janus monolayer ferromagnets with perpendicular magnetic anisotropy and high Curie temperature
• Relationship among Structural, Disordered, Magnetism and Band Topology in MnSb2Te4(Sb2Te3)n Family
• Giant and Broadband Circular Dichroism from Particle-Hole Symmetry Breaking in Weyl Semimetals
• Quantum anomalous Hall effect with high Chern number in two dimensional ferromagnets Ti2TeSO
• Synthesis of intrinsic magnetic topological insulator MnBi2nTe3n+1 family by chemical vapor transport method with feedback regulation
• Defect-induced displacement of topological surface state in quantum magnet MnBi${}_2$Te${}_4$