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High-temperature quantum anomalous Hall effect in buckled honeycomb antiferromagnets

Mohsen Hafez-Torbati1,* and Götz S. Uhrig2,†

  • *Contact author: m.hafeztorbati@gmail.com
  • †Contact author: goetz.uhrig@tu-dortmund.de
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Phys. Rev. B 113, L161105 – Published 6 April, 2026

DOI: https://doi.org/10.1103/nmxv-m2wf

Abstract

We propose Néel antiferromagnetic (AF) Mott insulators with a buckled honeycomb structure as potential candidates to host a high-temperature AF Chern insulator (AFCI). Using a generalized Kondo lattice model, we show that the staggered potential induced by a perpendicular electric field due to the buckling can drive the AF Mott insulator to an AFCI phase. We address the temperature evolution of the Hall conductance and the chiral edge states. The quantization temperature Tq, below which the Hall conductance is quantized, depends essentially on the strength of the spin-orbit coupling and the hopping parameter, independent of the specific details of the model. The deviation of the Hall conductance from the quantized value e2/h above Tq is found to be accompanied by a spectral broadening of the chiral edge states, reflecting a finite life-time, i.e., a decay. Using parameters typical for heavy transition-metal elements we predict that the AFCI can survive up to room temperature. We suggest Sr3CaOs2O9 as a potential compound to realize a high-T AFCI phase.

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Outline

Information

Phys. Rev. B 113, L161105– Published 6 April, 2026
  • Received 28 October 2025
  • Revised 27 January 2026
  • Accepted 9 March 2026
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