原子轨道
量子反常霍尔效应
铁磁性
单层
凝聚态物理
居里温度
联轴节(管道)
材料科学
化学
物理
量子霍尔效应
纳米技术
量子力学
电子
冶金
作者
Qingzhao Yao,Yunxing Xue,Bin Zhao,Ye Zhu,Li Z,Zhongqin Yang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-01-23
标识
DOI:10.1021/acs.nanolett.3c04098
摘要
Ferromagnetic (FM) states with high Curie temperatures (Tc) and strong spin–orbit coupling (SOC) are indispensable for the long-sought room-temperature quantum anomalous Hall (QAH) effects. Here, we propose a two-dimensional (2D) iron-based monolayer MgFeP that exhibits a notably high FM Tc (about 1525 K) along with exceptional structural stabilities. The unique multiorbital nature in MgFeP, where localized dx2−y2 and dxz/yz orbitals coexist with itinerant dxy and dz2 orbitals, renders the monolayer a Hund’s metal and in an orbital-selective Mott phase (OSMP). This OSMP triggers an FM double exchange mechanism, rationalizing the high Tc in the Hund’s metal. This material transitions to a QAH insulator upon consideration of the SOC effect. By leveraging orbital selectivity, the QAH band gap can be enlarged by more than two times (to 137 meV). Our findings showcase Hund’s metals as a promising material platform for realizing high-performance quantum topological electronic devices.
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