Momentum signatures for Schwinger pair production in short laser pulses with a subcycle structure.
Momentum signatures for Schwinger pair production in short laser pulses with a subcycle structure.
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DOI：
10.1103/physrevlett.102.150404
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发表时间：
2009-01
影响因子：
8.6
通讯作者：
F. Hebenstreit;R. Alkofer;G. Dunne;H. Gies
中科院分区：
文献类型：
--
作者：
F. Hebenstreit;R. Alkofer;G. Dunne;H. Gies
我们研究了在非微扰状态下，具有亚周期结构的短激光脉冲在真空中产生的电子-正电子对（Schwinger对的产生）。我们使用非平衡量子动力学方法，并表明所创建的电子-正电子对的动量谱对亚周期动力学非常敏感-取决于激光频率omega，脉冲长度tau和载流子相位varph -并显示出几个独特的新特征。这一观察结果不仅有助于激光脉冲的设计，以优化施翁格对产生的实验特征，而且最终有助于在极短的时间尺度上产生新的光脉冲探针。
We investigate electron-positron pair production from vacuum for short laser pulses with a subcycle structure, in the nonperturbative regime (Schwinger pair production). We use the nonequilibrium quantum kinetic approach and show that the momentum spectrum of the created electron-positron pairs is extremely sensitive to the subcycle dynamics-depending on the laser frequency omega, the pulse length tau, and the carrier phase varphi-and shows several distinctive new signatures. This observation could not only help in the design of laser pulses to optimize the experimental signature of Schwinger pair production but also ultimately lead to new probes of light pulses at extremely short time scales.