Discovery of Intrinsic Quantum Anomalous Hall Effect in Organic Mn-DCA Lattice

TL;DR

This paper predicts an intrinsic quantum anomalous Hall effect in Mn-DCA Kagome lattice, supported by ab initio calculations, topological analysis, and a tight-binding model, with a Curie temperature near room temperature.

Contribution

It introduces a new organic material platform exhibiting intrinsic QAH effect with high Curie temperature, advancing potential experimental realization.

Findings

Nonzero Chern number and quantized Hall conductivity confirm topological nontriviality.

Gapless chiral edge states demonstrate the QAH phase.

Estimated Curie temperature is around 253 K, near room temperature.

Abstract

The quantum anomalous Hall (QAH) phase is a novel topological state of matter characterized by a nonzero quantized Hall conductivity without an external magnetic field. The realizations of QAH effect, however, are experimentally challengeable. Based on ab initio calculations, here we propose an intrinsic QAH phase in DCA Kagome lattice. The nontrivial topology in Kagome bands are confirmed by the nonzero chern number, quantized Hall conductivity, and gapless chiral edge states of Mn-DCA lattice. A tight-binding (TB) model is further constructed to clarify the origin of QAH effect. Furthermore, its Curie temperature, estimated to be ~ 253 K using Monte-Carlo simulation, is comparable with room temperature and higher than most of two-dimensional ferromagnetic thin films. Our findings present a reliable material platform for the observation of QAH effect in covalent-organic frameworks.