论文标题
由循环极化磁场驱动的全光学非线性手性超快速磁化动力学
All-optical non-linear chiral ultrafast magnetization dynamics driven by circularly polarized magnetic fields
论文作者
论文摘要
Ultrafast激光脉冲提供了独特的工具来操纵飞秒时间尺度上的磁化动力学，其中电场的相互作用（例如，激发旋转载体与非平衡状态的激发，局部电荷电流的产生，emagnetization of Demagnetization或Faraday反向的效果 - 占主导地位 - 磁场上的效应在磁场上占主导地位。使用结构化激光束的最新建议启发了产生强烈飞秒磁场的可能性，从电场上空间分离。在这里，我们证明了这种新型方案与femtomagnetism的相关性，揭示了磁化强度纯粹的前疗，非线性的，手性的反应。这一基本结果不仅在激光诱导的超快磁化动力学的研究中开辟了一条途径，而且还持续了技术含义，作为促进全光学非热磁化的途径，在较短的时间表上 - 朝着attosecond concime-和thz频率下的途径。
Ultrafast laser pulses provide unique tools to manipulate magnetization dynamics at femtosecond timescales, where the interaction of the electric field -- such as excitation of spin carriers to non-equilibrium states, generation of localized charge currents, demagnetization, or inverse Faraday effect -- dominates over the magnetic field. Recent proposals using structured laser beams have enlightened the possibility to generate intense femtosecond magnetic fields, spatially isolated from the electric field. Here we demonstrate the relevance of this novel scenario to femtomagnetism, unveiling the purely precessional, non-linear, chiral response of the magnetization when subjected to circularly polarized magnetic fields. This fundamental result not only opens an avenue in the study of laser-induced ultrafast magnetization dynamics, but also sustains technological implications as a route to promote all-optical non-thermal magnetization switching both at shorter timescales -- towards the attosecond regime -- and at THz frequencies.
