在玻璃中启用光子-动量的电子拉曼散射
Sergey S Kharintsev1, Elina I Battalova1, Aleksey I Noskov1,2
1Department of Optics and Nanophotonics, Institute of Physics, Kazan Federal University, Kazan 420008, Russia.
ACS nano
|March 4, 2024
概括
玻璃中的结构性障碍驱动了通过电子拉曼散射增强的光辐射,而不是通过声子辅助的过渡. 这种现象涉及被困的电子和光子动量,为纳米结构材料的光发射提供了新的见解.
科学领域:
- 固态物理 固态物理
- 材料科学 是一种材料科学.
- 纳米技术 纳米技术
背景情况:
- 在无序和无形固体,特别是纳米结构中的增强光辐射仍然不完全理解.
- 晶体半导体通常不会表现出观察到的光发射现象.
研究的目的:
- 为了研究异质交联玻璃中的结构光辐射,一个模型系统桥接无形和晶体状态.
- 阐明这种无序材料中光辐射背后的机制,探索尺寸,无序和电子转换的作用.
主要方法:
- 在结构尺寸分布狭窄的异质交联玻璃中研究光辐射.
- 分析了光辐射对各种能量范围的大小和混乱的依赖性.
- 将实验观测与语音辅助间接光学转换和电子拉曼散射模型进行了比较.
主要成果:
- 观察到光辐射对玻璃尺寸和混乱的明显依赖.
- 发现语音辅助过渡不足以解释观察到的排放.
- 确定了电子拉曼散射作为主导机制,由结构障碍和被困电子在带间隙 (Urbach桥) 驱动.
结论:
- 无序玻璃中的光辐射主要由电子拉曼散射控制,而不是由声子辅助的过渡.
- 在带间隙内存在过多的电子状态和电子-光子动量匹配是至关重要的.
- 光子动量在纳米级无序固体的光学反应中起着重要作用.
相关概念视频
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