Quantum calculation of the Vavilov-Cherenkov radiation by twisted electrons
Quantum calculation of the Vavilov-Cherenkov radiation by twisted electrons
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DOI：
10.1103/physreva.93.053825
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发表时间：
2016-02
影响因子：
2.9
通讯作者：
I. Ivanov;V. Serbo;V. Zaytsev
中科院分区：
文献类型：
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作者：
I. Ivanov;V. Serbo;V. Zaytsev
我们给出了透明介质中相对论扭曲电子辐射的详细量子电动力学描述。得到了发射辐射的光谱分布、谱角分布以及偏振特性的简单表达式。与平面波的情况不同，扭曲的电子在环形角区内产生辐射，并向其边界增强。此外，发射的光子不仅在散射面上可以有线偏振，而且在垂直方向上也可以有线偏振。我们发现，在两个涡旋态的叠加中，电子发出的Vavilov-Cherenkov辐射具有很强的方位不对称性。因此，瓦维洛夫-切伦科夫辐射为此类电子提供了一种方便的诊断工具，并补充了传统的显微成像。
We present the detailed quantum electrodynamical description of Vavilov-Cherenkov radiation emitted by a relativistic twisted electron in the transparent medium. Simple expressions for the spectral and spectral-angular distributions as well as for the polarization properties of the emitted radiation are obtained. Unlike the plane-wave case, the twisted electron produces radiation within the annular angular region, with enhancement towards its boundaries. Additionally, the emitted photons can have linear polarization not only in the scattering plane but also in the orthogonal direction. We find that the Vavilov-Cherenkov radiation emitted by an electron in a superposition of two vortex states exhibits a strong azimuthal asymmetry. Thus, the Vavilov-Cherenkov radiation offers itself as a convenient diagnostic tool of such electrons and complements the traditional microscopic imaging.