在质子辐射下,冷热石墨烯的电子发射的不平衡动力学
Yifan Yao1, Alina Kononov2, Arne Metzlaff3
1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.
Nano letters
|April 8, 2024
概括
二维材料的二次电子发射由复杂的放松过程控制. 格子温度显著影响排放,为高分辨率探测提供了潜力.
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
- 表面科学是一门学科.
背景情况:
- 从二维 (2D) 材料的二次电子发射 (SEE) 是复杂的.
- 了解放松过程是使用SEE作为高分辨率探针的关键.
研究的目的:
- 阐明2D材料中SEE控制的多长度和多时间尺度放松过程.
- 对SEE的实验数据进行理论模型的验证.
- 评估温度对SEE的影响.
主要方法:
- 结合第一原则实时电子动力学模拟与辐射实验.
- 利用石墨烯的冷热质子辐射.
- 开发了一种用于预测动能光谱的新方法.
主要成果:
- 观察到对质子辐射石墨烯的实验和理论电子产量之间的良好一致.
- 动力和潜在排放机制的识别签名.
- 确定了大约1.5 fs的发射脉冲持续时间,表明了高时间分辨率.
- 证明了新方法对动能光谱的预测能力.
结论:
- 格子温度显著增加了二次电子发射.
- 电子温度对二次电子排放的影响微不足道.
- 这些发现支持使用来自二维材料的SEE作为高分辨率热化探针.
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