Pair production in differently polarized electric fields with frequency chirps
Pair production in differently polarized electric fields with frequency chirps
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具有频率啁啾的不同极化电场中的电对产生
DOI：
10.1103/physrevd.99.036003
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发表时间：
2019
影响因子：
5
通讯作者：
Reinhard Alkofer
中科院分区：
文献类型：
--
作者：
Obulkasim Olugh;Zi-Liang Li;Bai-Song Xie;Reinhard Alkofer
强电场中的电子-正电子对产生，即，Sauter-Schwinger效应，使用实时Dirac-Heisenberg-Wigner形式主义进行了研究。据此，电场被建模为具有亚临界峰值场强的均匀单脉冲场。动量谱计算了四种不同的偏振-线性，椭圆，近圆椭圆或圆形，以及一些线性频率啁啾。由于细节取决于所选择的偏振，频率啁啾导致强烈的干涉效应，从而导致动量谱的相当大的变化。由此产生的对的数量密度非线性地依赖于表征偏振的参数，并且对啁啾参数的变化非常敏感。对于一些研究的频率啁啾，这可以提供3至4个数量级的数量密度的增强。
Electron-positron pair production in strong electric fields, i.e., the Sauter-Schwinger effect, is studied using the real-time Dirac-Heisenberg-Wigner formalism. Hereby, the electric field is modeled to be a homogeneous, single-pulse field with subcritical peak field strength. Momentum spectra are calculated for four different polarizations—linear, elliptic, near-circular elliptic or circular—as well as a number of linear frequency chirps. With details depending on the chosen polarization, the frequency chirps lead to strong interference effects and thus quite substantial changes in the momentum spectra. The resulting produced pairs’ number densities depend nonlinearly on the parameter characterizing the polarization and are very sensitive to variations of the chirp parameter. For some of the investigated frequency chirps, this can provide an enhancement of the number density by 3 to 4 orders of magnitude.