轨道选择性诱导的强大的量子异常霍尔效应在数百种金属中MgFeP
Qingzhao Yao1,2, Yang Xue3, Bao Zhao4
1State Key Laboratory of Surface Physics and Key Laboratory of Computational Physical Sciences (MOE) and Department of Physics, Fudan University, Shanghai 200433, China.
Nano letters
|January 23, 2024
概括
研究人员发现了MgFeP,一种具有高基里温度 (1525 K) 和结构稳定的二维单层材料. 这个Hund的金属表现出轨道选择性Mott相,使量子异常的霍尔效应具有显著扩大带间隙.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子计算是一种量子计算.
背景情况:
- 高基里温度 (Tc) 铁磁 (FM) 状态和强的旋转轨道合 (SOC) 对于实现室温量子异常霍尔 (QAH) 效应至关重要.
- 开发具有强大的FM特性和显著的SOC的新型2D材料对于推进拓电子设备至关重要.
研究的目的:
- 提出和研究一种新的2D铁基单层MgFeP,因为它有可能承受高温QAH效应.
- 探索MgFeP的电子和磁性特性,重点关注其多轨道性质和轨道选择性Mott相 (OSMP) 的作用.
主要方法:
- 使用第一原则计算来研究二维MgFeP单层的结构,电子和磁性特性.
- 该研究分析了多轨道电子结构,确定了局部和流动轨道,这些轨道对材料的独特相位有所贡献.
- 研究了旋转轨道合 (SOC) 对电子带结构和QAH状态的出现的影响.
主要成果:
- FeP具有高铁磁克里度温度 (Tc) 约为1525K和优异的结构稳定性.
- 该材料显示了一个独特的多轨道电子结构,以轨道选择性Mott相 (OSMP) 中的Hund's金属为特征.
- 这种OSMP促进了双重交换机制,解释了高Tc,并允许在加入SOC时过渡到QAH绝缘体,带宽间隙扩大到137 meV.
结论:
- FeP是高性能量子拓电子设备的有前途的二维材料,因为它具有高Tc和可调的QAH特性.
- 展示OSMP的数百种金属代表了实现强大的室温QAH效应的可行材料平台.
- 利用轨道选择性提供了一条途径,可以显著增强QAH带间隙,这对于实际应用至关重要.
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