Anomalous Stopping and Charge Transfer in Proton-Irradiated Graphene
Anomalous Stopping and Charge Transfer in Proton-Irradiated Graphene
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DOI：
10.1021/acs.nanolett.1c01416
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发表时间：
2021-05-25
期刊：
影响因子：
10.8
通讯作者：
Schleife, Andre
中科院分区：
文献类型：
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作者：
Kononov, Alina;Schleife, Andre
我们用第一性原理计算揭示并解释了质子辐照石墨烯中一种新型的反常低速停止效应。我们将专门用于引导质子的肩部特征归因于从sigma轨道和pi轨道增强的电子俘获。我们对电子发射的分析表明，向后发射比正向发射对质子轨迹更敏感，因此可以在离子显微镜中产生更高的对比度图像。对于慢质子，我们观察到发射量急剧下降，这与分析模型的预测一致。
We use first-principles calculations to uncover and explain a new type of anomalous low-velocity stopping effect in proton-irradiated graphene. We attribute a shoulder feature that occurs exclusively for channeling protons to enhanced electron capture from sigma- and and pi-orbitals. Our analysis of electron emission indicates that backward emission is more sensitive to proton trajectory than forward emission and could thus produce higher contrast images in ion microscopy. For slow protons, we observe a steep drop in emission, consistent with predictions from analytical models.