单光子和双光子干涉共振控制光电子方向性
Resonant control of photoelectron directionality by interfering one- and two-photon pathways
摘要：
相干控制干涉单光子和双光子过程几十年来一直是研究的主题，以实现光电流的重定向。基于多通道量子亏损和R矩阵计算，研究了基态氦原子阈上光电离的双通道相干控制，能量可达$N=2$阈值.在我们的处理中控制三个参数：光干涉相位$ΔΦ$、约化电场强度$χ=\mathcal{E}_ω^2/{\mathcal{E}_{2ω}}$和终态能量$ε$。通过能量在$2p^2\ ^1S^e$共振附近的光电子的$90\%$翻转其发射方向的示例，示出了共振附近的小能量变化以高效率翻转光电子的发射方向。然而，在中间态能量下电离的大部分光电子不受光学控制的影响，使得这种控制方案在实验上具有挑战性。
英文摘要：
Coherent control of interfering one- and two-photon processes has for decades been the subject of research to achieve the redirection of photocurrent. The present study develops two-pathway coherent control of ground state helium atom above-threshold photoionization for energies up to the $N=2$ threshold, based on a multichannel quantum defect and R-matrix calculation. Three parameters are controlled in our treatment: the optical interference phase $ΔΦ$, the reduced electric field strength $χ=\mathcal{E}_ω^2/{\mathcal{E}_{2ω}}$, and the final state energy $ε$. A small energy change near a resonance is shown to flip the emission direction of photoelectrons with high efficiency, through an example where $90\%$ of photoelectrons whose energy is near the $2p^2\ ^1S^e$ resonance flip their emission direction. However, the large fraction of photoelectrons ionized at the intermediate state energy, which are not influenced by the optical control, make this control scheme challenging to realize experimentally.
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