Ultrafast dynamics of orbital angular momentum of electrons induced by femtosecond laser pulses: Generation and transfer across interfaces
Ultrafast dynamics of orbital angular momentum of electrons induced by femtosecond laser pulses: Generation and transfer across interfaces
复制标题
飞秒激光脉冲引起的电子轨道角动量的超快动力学：跨界面的产生和传输
作者：
O. Busch;Franziska Ziolkowski;I. Mertig;J. Henk
电子的轨道角动量在超快电子和磁化动力学中起着越来越重要的作用。在这篇理论研究中，我们研究了飞秒激光脉冲在正常金属、铁磁体以及铁磁体/正常金属异质结中诱导的电子动力学。我们分析了激光诱导的OAM和它们各自的电流的时空分布。我们的研究结果表明，圆偏振激光脉冲可以诱导一个相当大的和持久的OAM组件在正常的金属。此外，铁磁体和正常金属之间的界面通过OAM对总磁化的贡献促进磁体的退磁。最后，为了将OAM从铁磁体转移到正常金属中，有利的是使用在铁磁体中而不是在正常金属中感应期望的OAM分量的激光设置。
The orbital angular momenta (OAM) of electrons play an increasingly important role in ultrafast electron and magnetization dynamics. In this theoretical study, we investigate the electron dynamics induced by femtosecond laser pulses in a normal metal, a ferromagnet, and a ferromagnet/normal metal heterostructure. We analyze the spatio-temporal distributions of the laser-induced OAM and their respective currents. Our findings demonstrate that a circularly polarized laser pulse can induce a sizable and long-lasting OAM component in a normal metal. Furthermore, an interface between a ferromagnet and a normal metal facilitates the demagnetization of the magnet by the OAM contribution to the total magnetization. Finally, to transfer OAM from a ferromagnet into a normal metal, it is advantageous to use a laser setup that induces the desired OAM component in the ferromagnet, but not in the normal metal.
影响因子：
16.6
作者：
Rudolf, Dennis;La-O-Vorakiat, Chan;Oppeneer, Peter M.
通讯作者：
Oppeneer, Peter M.