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arXiv · 2107.07381

Large-Gap Quantum Anomalous Hall Effect in Monolayer Halide Perovskite

Zeyu Li·Yulei Han·Zhenhua Qiao
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Abstract

We theoretically propose a family of structurally stable monolayer halide perovskite A$_3$B$_2$C$_9$ (A=Rb, Cs; B=Pd, Pt; C=Cl, Br) with easy magnetization planes. These materials are all half-metals with large spin gaps over 1~eV accompanying with a single spin Dirac point located at K point. When the spin-orbit coupling is switched on, we further show that Rb$_3$Pt$_2$Cl$_9$, Cs$_3$Pd$_2$Cl$_9$, and Cs$_3$Pt$_2$Cl$_9$ monolayers can open up large band gaps from 63 to 103 meV to harbor quantum anomalous Hall effect with Chern numbers of $\mathcal{C}=\pm1$, whenever the mirror symmetry is broken by the in-plane magnetization. The corresponding Berezinskii-Kosterlitz-Thouless transition temperatures are over 248~K. Our findings provide a potentially realizable platform to explore quantum anomalous Hall effect and spintronics at high temperatures.

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Zeyu Li, Yulei Han, Zhenhua Qiao. 2021-07-15. Large-Gap Quantum Anomalous Hall Effect in Monolayer Halide Perovskite. https://doi.org/10.1103/physrevb.104.205401

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