轨道电子学:通过太赫兹发射实验研究Ni中的光诱导轨道电流
Yong Xu1,2,3, Fan Zhang3, Albert Fert4,5
1National Key Lab of Spintronics, International Innovation Institute, Beihang University, Hangzhou, 311115, China.
Nature communications
|March 6, 2024
概括
科学家们在中展示了光诱导的轨道电流,这是轨道电子学的新方法. 这些通过太赫兹发射检测到的轨道电流显示出新型电子设备的潜力.
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
- 螺旋电子和轨道电子.
背景情况:
- 轨道电子利用轨道电流作为信息载体,并建立了从电荷或自旋电流生成它们的方法.
- 轨道电流的逆转换回充电或旋转电流也是一个已知的现象.
研究的目的:
- 为了演示使用上的秒光脉冲产生轨道电流的过程.
- 研究这些光诱导轨道电流的检测和特征,以及它们的转化为电荷电流.
- 探索这些发现的潜力,开发新的轨道电子设备,特别是在太赫兹模式.
主要方法:
- 制造多层结构,将与氧化物和铜等非磁性金属结合在一起.
- 利用 femtosecond 激光脉冲在层中诱导轨道电流.
- 探测轨道电流通过它们的转化为电荷电流,由太赫兹发射证明.
- 分析太赫兹脉冲的时间延迟,以确定轨道载体速度和传播长度.
主要成果:
- 在基于的系统中成功生成并检测到光诱导的轨道电流.
- 观察到轨道电流在Ni基材料中明显占据主导地位,而不是光诱导的自旋电流.
- 证明了轨道电流的转化为电荷电流,导致太赫兹发射.
- 通过时间解析的太赫兹辐射分析,获得了关于轨道载体的速度和传播长度的见解.
- 与基于CoFeB的系统相反的发现,只检测到自旋电流.
结论:
- 这项研究建立了使用光脉冲产生轨道电流的新方法,扩大了轨道电子学工具包.
- 在基于Ni的系统中,轨道电流在旋转电流上占主导地位,为设备应用提供了独特的优势.
- 观测到的光诱导轨道电流及其转换为电荷电流为开发先进的轨道电子太赫兹设备开辟了新的途径.
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