Observation of the quantum shift of a backward rescattering caustic by carrier-envelope phase mapping
Observation of the quantum shift of a backward rescattering caustic by carrier-envelope phase mapping
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通过载流子包络相位映射观察后向重散射焦散的量子位移
DOI：
10.1103/physreva.103.043121
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发表时间：
2021
影响因子：
2.9
通讯作者：
Itatani Jiro
中科院分区：
文献类型：
--
作者：
Mizuno Tomoya;Ishii Nobuhisa;Kanai Teruto;Rosenberger Philipp;Zietlow Dominik;Kling Matthias F.;Tolstikhin Oleg I.;Morishita Toru;Itatani Jiro
研究了线偏振亚二周期近红外激光脉冲强场电离双原子产生的载流子包络相位（CEP）依赖的光电子动量分布（PEMD）。利用绝热再散射理论分析了偏振方向上PEMD截止结构的位置和形状[T。Morishita和O. I. Tolstikhin，Phys. Rev. A 96，053416（2017）2469-992610.1103/PhysRevA.96.053416]。该理论预测，PEMD开始指数衰减的截止位于量子焦散，该量子焦散相对于相应的经典焦散向更高的能量移动，在该经典焦散处，长和短的向后再散射轨迹合并。在PEMD中观察到的截止位置与绝热理论吻合得很好，证实了焦散的量子位移。这一结果为从强场PEMD中依赖于CEP的截止值提取电子-离子弹性散射微分截面的更准确程序铺平了道路。
We study carrier-envelope phase (CEP) -dependent photoelectron momentum distributions (PEMDs) generated by strong-field ionization of Xe atoms with linearly polarized sub-two-cycle near-infrared laser pulses. The PEMDs in the polarization direction end with a cutoff structure whose position and shape are analyzed using the adiabatic theory of rescattering [T. Morishita and O. I. Tolstikhin, Phys. Rev. A 96, 053416 (2017)2469-992610.1103/PhysRevA.96.053416]. This theory predicts that the cutoff, wherein the PEMD begins to exponentially decay, is located at a quantum caustic that is shifted towards higher energies with respect to the corresponding classical caustic at which long and short backward rescattering trajectories coalesce. The observed position of the cutoff in the PEMDs agrees well with the adiabatic theory, confirming the quantum shift of the caustic. This result paves the way to a more accurate procedure for extracting electron-ion elastic scattering differential cross sections from CEP-dependent cutoffs in strong-field PEMDs.