强激光场中涡旋电子的动力学过程  

Dynamical processes of vortex electrons in intense laser field

作　　者：陈家定 陈月月 CHEN Jiading;CHEN Yueyue(Mathematics and Science College,Shanghai Normal University,Shanghai 200234,China)

机构地区：[1]上海师范大学数理学院,上海200234

出　　处：《上海师范大学学报（自然科学版）》2023年第5期590-596,共7页Journal of Shanghai Normal University(Natural Sciences)

基　　金：国家自然科学基金(12074262);国家重点研发计划青年科学家项目(12074262);上海市青年科技启明星计划(2021YFA1601700)。

摘　　要：研究了携带固有轨道角动量的强涡旋电子在强激光中的动力学过程.利用相对论拉莫进动方程和自旋进动方程(T-BMT)方程,研究了涡旋电子的内禀轨道角动量和自旋角动量在啁啾激光场中的演化规律.由于啁啾激光脉冲的不对称性,初始静止的涡旋电子在啁啾脉冲的作用下获得了MeV的加速,并实现了自旋和固有轨道角动量的纵向旋转.因此,通过调控啁啾激光的啁啾参数可以获得具有任意角动量方向的相对论涡旋电子.此外,在Foldy-Wouthuysen表象中,强涡旋电子的运动受到类Stern-Gerlach力的显著影响,从而偏离散射平面.这一现象揭示了轨道角动量和电磁场的相互作用及其与电子动量之间的内在关联,并为控制相对论电子的运动提供了一种全新的手段.In this paper,the dynamic processes of strong vortex electrons with inherent orbital angular momentum in intense laser are studied.The evolution of the intrinsic orbital and spin angular momentum of a vortex electron in a chirped laser field is studied by using the relativistic Lamor equations and Thomas-Bargmann-Michel-Telegdi(T-BMT)equations.Due to the asymmetry of the chirped laser pulse,the initially stationary vortex electrons get the MeV acceleration under the chirped pulse,and realize the longitudinal rotation of the spin and the inherent orbital angular momentum.Therefore,relativistic vortex electrons with any angular momentum direction can be obtained by adjusting the chirped parameters of the chirped laser.In addition,in the Foldy-Wouthuysen representation,the motion of strong vortex electrons is significantly affected by Stern-Gerlach forces and deviates from the scattering plane.This phenomenon reveals the interaction of orbital angular momentum and electromagnetic field and its intrinsic relationship with electron momentum,and provides an entirely new means for controlling the motion of relativistic electrons.

关 键 词：涡旋电子 轨道角动量 啁啾激光脉冲 Stern-Gerlach力 

分 类 号：O442[理学—电磁学]