论文标题
电子的全息角条纹和WIGNER时间延迟
Holographic Angular Streaking of Electrons and the Wigner-Time Delay
论文作者
论文摘要
对于$2Ω$的中央频率的圆极化单色场，强场电离时的最终电子动量分布不会带有有关初始动量分布相位的任何信息。在$ω$的中央频率下添加弱的，共旋转的圆形极化场会产生亚周期干扰模式（电子的全息角条纹（HASE））。这种干扰模式允许在隧道$ ϕ^{\ prime} _ {\ mathrm {off}}}（p_i）$后检索初始动量分布的阶段的衍生物。引入了基于轨迹的半古典模型（HASE模型），该模型将实验可访问的数量链接到$ ϕ^{\ prime} _ {\ mathrm {off}}（p_i）$。结果表明，$ ϕ^{\ prime} _ {\ mathrm {off}} $的更改等于位置空间中的位置$ΔX$在隧穿后的初始波数据包的位置。该位置空间中的这种偏移允许对圆形极化单色场的强场电离中的Wigner时间延迟$Δτ_W$进行直观的解释。定量研究了隧穿后库仑相互作用的影响。
For a circularly polarized single-color field at a central frequency of $2ω$ the final electron momentum distribution upon strong field ionization does not carry any information about the phase of the initial momentum distribution. Adding a weak, co-rotating, circularly polarized field at a central frequency of $ω$ gives rise to a sub-cycle interference pattern (holographic angular streaking of electrons (HASE)). This interference pattern allows for the retrieval of the derivative of the phase of the initial momentum distribution after tunneling $ϕ^{\prime}_{\mathrm{off}}(p_i)$. A trajectory-based semi-classical model (HASE model) is introduced which links the experimentally accessible quantities to $ϕ^{\prime}_{\mathrm{off}}(p_i)$. It is shown that a change in $ϕ^{\prime}_{\mathrm{off}}$ is equivalent to a displacement in position space $Δx$ of the initial wave packet after tunneling. This offset in position space allows for an intuitive interpretation of the Wigner time delay $Δτ_W$ in strong field ionization for circularly polarized single-color fields. The influence of Coulomb interaction after tunneling is investigated quantitatively.
