论文标题
亚周期的强场隧穿电离：识别磁偶极子和电二极管效应
Subcycle resolved strong-field tunneling ionization: Identification of magnetic dipole and electric quadrupole effects
论文作者
论文摘要
强激光脉冲与物质传输的相互作用不仅能量，而且还具有光子的线性动量。最近的实验进步使得可以检测到原子强场电离中传递给光电子的少量线性动量。线性动量传递是超出其偶极极限的激光原子相互作用的独特签名。在这里，我们提出了亚周期分辨线性动量在其多极组件方面的分解。我们表明，磁性偶极贡献在动态隧道过程中主导了线性动量转移，而在连续元中电子的野外运动运动中的纵向纵向动量转移主要由电肢相互作用控制。或者，利用辐射量表，我们识别非酮动量转移效应，该效应与耦合到激光场的耦合线性或四次缩放。目前的结果提供了详细的见解，了解由非二唑效应引起的亚周线性动量转移的基础物理机制。
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. Linear momentum transfer is a unique signature of the laser-atom interaction beyond its dipolar limit. Here, we present a decomposition of the subcycle time-resolved linear momentum transfer in term of its multipolar components. We show that the magnetic dipole contribution dominates the linear momentum transfer during the dynamical tunneling process while the post-ionization longitudinal momentum transfer in the field-driven motion of the electron in the continuum is primarily governed by the electric quadrupole interaction. Alternatively, exploiting the radiation gauge, we identify nondipole momentum transfer effects that scale either linearly or quadratically with the coupling to the laser field. The present results provide detailed insights into the physical mechanisms underlying the subcycle linear momentum transfer induced by nondipole effects.
