Ni Hongcheng, Brennecke Simon, Gao Xiang, He Pei-Lun, Donsa Stefan, Březinová Iva, He Feng, Wu Jian, Lein Manfred, Tong Xiao-Min, Burgdörfer Joachim
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China.
Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna, Austria, European Union.
Phys Rev Lett. 2020 Aug 14;125(7):073202. doi: 10.1103/PhysRevLett.125.073202.
Interaction of a strong laser pulse with matter transfers not only energy but also linear momentum of the photons. Recent experimental advances have made it possible to detect the small amount of linear momentum delivered to the photoelectrons in strong-field ionization of atoms. We present numerical simulations as well as an analytical description of the subcycle phase (or time) resolved momentum transfer to an atom accessible by an attoclock protocol. We show that the light-field-induced momentum transfer is remarkably sensitive to properties of the ultrashort laser pulse such as its carrier-envelope phase and ellipticity. Moreover, we show that the subcycle-resolved linear momentum transfer can provide novel insights into the interplay between nonadiabatic and nondipole effects in strong-field ionization. This work paves the way towards the investigation of the so-far unexplored time-resolved nondipole nonadiabatic tunneling dynamics.
强激光脉冲与物质的相互作用不仅传递能量，还传递光子的线性动量。最近的实验进展使得检测在原子的强场电离过程中传递给光电子的少量线性动量成为可能。我们给出了数值模拟以及通过阿秒光钟协议可获取的亚周期相位（或时间）分辨的动量转移到原子的解析描述。我们表明，光场诱导的动量转移对超短激光脉冲的特性（如载波包络相位和椭圆率）非常敏感。此外，我们表明亚周期分辨的线性动量转移可以为强场电离中非绝热和非偶极效应之间的相互作用提供新的见解。这项工作为研究迄今未探索的时间分辨非偶极非绝热隧穿动力学铺平了道路。
