Semiclassical limitations for photon emission in strong external fields
Semiclassical limitations for photon emission in strong external fields
复制标题
强外场中光子发射的半经典限制
DOI：
10.1103/physreva.99.052513
复制
发表时间：
2018
影响因子：
2.9
通讯作者：
K. Hatsagortsyan
中科院分区：
文献类型：
--
作者：
E. Raicher;S. Eliezer;C. Keitel;K. Hatsagortsyan
Baier-Katkov 的半经典启发式发射公式 [Sov.物理。 JETP \textbf{26}, 854 (1968)] 众所周知，利用电子的经典轨迹描述了强外部场中超相对论电子的辐射。为了找出 Baier-Katkov 方法的局限性，我们使用 Wentzel-Kramers-Brillouin 近似从量子力学角度研究强旋转电场中的电子辐射。除了超相对论速度之外，结果表明还需要附加条件才能恢复广泛使用的半经典结果。违反此条件会导致两个后果。首先，这会导致两种方法之间谐波谱的定性差异。其次，量子谐波谱不仅由经典轨迹决定，还由外场有效光子的色散关系决定。
The semi-classical heuristic emission formula of Baier-Katkov [Sov. Phys. JETP \textbf{26}, 854 (1968)] is well-known to describe radiation of an ultrarelativistic electron in strong external fields employing the electron's classical trajectory. To find the limitations of the Baier-Katkov approach, we investigate electron radiation in a strong rotating electric field quantum mechanically using the Wentzel-Kramers-Brillouin approximation. Except for an ultrarelativistic velocity, it is shown that an additional condition is required in order to recover the widely used semi-classical result. A violation of this condition leads to two consequences. First, it gives rise to qualitative discrepancy in harmonic spectra between the two approaches. Second, the quantum harmonic spectra are determined not only by the classical trajectory but also by the dispersion relation of the effective photons of the external field.
影响因子：
2.9
作者：
A. Piazza;M. Tamburini;S. Meuren;S. Meuren;C. Keitel
通讯作者：
A. Piazza;M. Tamburini;S. Meuren;S. Meuren;C. Keitel
影响因子：
12.5
作者：
Cole, J. M.;Behm, K. T.;Mangles, S. P. D.
通讯作者：
Mangles, S. P. D.