Coulomb-corrected strong-field quantum trajectories beyond dipole approximation
Coulomb-corrected strong-field quantum trajectories beyond dipole approximation
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DOI：
10.1088/1361-6455/aa8ab1
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发表时间：
2017-10-14
影响因子：
1.6
通讯作者：
Bauer, D.
中科院分区：
文献类型：
--
作者：
Keil, Th;Bauer, D.
强场光电子动量谱中的非偶极子效应已被实验揭示(Smeenk等人，2011物理。莱特牧师。193002；路德维希等人，2014年物理。莱特牧师。113 243001)。对于某些激光参数和光电子动量，光谱与激光传播方向相反，而人们天真地假设v×B力所产生的辐射压力总是在传播方向上推动电子。只有洛伦兹和库伦力之间的相互作用才可能产生这种违反直觉的动力学。在这项工作中，我们通过将基于量子轨迹的库仑校正强场近似推广到偶极近似来计算传输方向上和相反方向上的动量相关移位。一种半解析处理方法，其中磁力和库仑力都被微扰处理，但同时再现了运动方程的完全数值解的结果。
Non-dipole effects in strong- field photoelectron momentum spectra have been revealed experimentally (Smeenk et al 2011 Phys. Rev. Lett. 106 193002; Ludwig et al 2014 Phys. Rev. Lett. 113 243001). For certain laser parameters and photoelectron momenta the spectra were found to be shifted against the laser propagation direction whereas one would naively assume that the radiation pressure due to the v x B-force pushes electrons always in the propagation direction. Only the interplay between Lorentz and Coulomb forces may give rise to such counterintuitive dynamics. In this work, we calculate the momentum-dependent shift in and against the propagation direction by extending the quantum trajectory-based Coulomb-corrected strong-field approximation beyond the dipole approximation. A semi-analytical treatment where both magnetic and Coulomb forces are treated perturbatively but simultaneously reproduces the results from the full numerical solution of the equations of motion.