在Axion反铁磁铁中,具有可调节层霍尔效应的光诱导拓相变
1Center for Alloy Innovation and Design, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.
Nano letters
|June 7, 2024
概括
循环极化光可以在MnBi2Te4薄膜中将轴向绝缘体转换为量子异常的霍尔态. 这种光驱动的Floquet工程揭示了可调整的切尔恩数和依赖层的霍尔效应,并具有潜在的自旋电子应用.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
- 量子光学就是一个量子光学.
背景情况:
- 材料中的拓现象提供了独特的电子性质.
- 光-物质相互作用是控制量子状态的关键.
- 轴子绝缘体和量子异常霍尔态是异国情调的拓相.
研究的目的:
- 从理论上提出并通过计算证明光诱导的拓相位过渡.
- 为了研究利用循环极化光在MnBi2Te4薄膜中对拓状态的操纵.
- 探索层间和磁性接近效应对拓性质的作用.
主要方法:
- 光物质相互作用的理论建模.
- 用MnBi2Te4薄膜进行计算模拟.
- 浮板工程用于诱导拓相位过渡.
- 对分层解析的异常霍尔效应和贝里曲率的分析.
主要成果:
- 循环极化光将轴的绝缘相转化为量子异常的霍尔状态.
- 可调整的切尔恩数 (高达±2) 通过光驱动的Floquet工程实现.
- 异常的霍尔导电在介质时定位在Bi2Te3层中,这表明了磁近距离效应.
- 磁光克尔效应变异为拓过渡提供了一个非接触式检测方法.
结论:
- 在MnBi2Te4薄膜中,可以实现光驱动的拓相变.
- 在拓性反铁磁体中的层霍尔效应为旋电学提供了新的途径.
- 这项工作提供了一个探索新出现的拓阶段及其应用的策略.
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