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<p>Following the experimental realization of Quantum anomalous Hall (QAH) effect in thin films of chromium-doped (Bi,Sb)<sub>2</sub>Te<sub>3</sub>, enhancing the work temperature of QAH effect has emerged as a significant and challenging task. Here we demonstrate monolayer TbCl as a promising candidate to realize the room temperature QAH effect. Using DFT+U method, double-checked by HSE06 and DMFT calculations, we identify the Hall conductivity <i>G</i> = −<i>e</i><sup>2</sup>/<i>h</i> per layer in three-dimensional ferromagnetic insulator TbCl, which is a weakly stacked QAH layer. The monolayer TbCl inherits the magnetic and topological properties, exhibiting the QAH effect with Chern number <i>C</i> = −1. The large topological band gap reaches 42.8 meV, which is beyond room temperature. The extended 5<i>d</i> electrons lead to sizable exchange and superexchange interactions, resulting in a high Curie temperature <i>T</i><sub><i>c</i></sub> ~ 457 K. All these features demonstrate that monolayer TbCl will provide an ideal platform to realize the room temperature QAH effect.</p>

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5d orbital induced room temperature quantum anomalous Hall effect in TbCl

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月17日

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  • Jianqi Zhong,
  • Jianzhou Zhao,
  • Jinyu Zou,
  • Gang Xu

摘要

Following the experimental realization of Quantum anomalous Hall (QAH) effect in thin films of chromium-doped (Bi,Sb)2Te3, enhancing the work temperature of QAH effect has emerged as a significant and challenging task. Here we demonstrate monolayer TbCl as a promising candidate to realize the room temperature QAH effect. Using DFT+U method, double-checked by HSE06 and DMFT calculations, we identify the Hall conductivity G = −e2/h per layer in three-dimensional ferromagnetic insulator TbCl, which is a weakly stacked QAH layer. The monolayer TbCl inherits the magnetic and topological properties, exhibiting the QAH effect with Chern number C = −1. The large topological band gap reaches 42.8 meV, which is beyond room temperature. The extended 5d electrons lead to sizable exchange and superexchange interactions, resulting in a high Curie temperature Tc ~ 457 K. All these features demonstrate that monolayer TbCl will provide an ideal platform to realize the room temperature QAH effect.