Scaling laws of magnetically driven high-order harmonic generation in spin–orbit coupled systems
Year: 2025
Type: article
Abstract: We investigate the scaling behavior of high harmonic generation (HHG) driven by magnetic dynamics in spin–orbit coupled systems. In contrast to optically driven HHG-where the harmonic cutoff scales as ω −3 with the driving frequency ω -our time-dependent quantum transport simulations reveal a qualitatively distinct scaling law for magnetically driven HHG in the presence of spin–orbit interaction: the harmonic cutoff n max scales as ω −1 . This fundamental difference arises from distinct excitation mechanisms-namely, spin-flip transitions driven by vectorial magnetic precession, as opposed to scalar electric fields. Furthermore, we demonstrate that the precession cone angle θ serves as a crucial control parameter. Increasing θ broadens the harmonic bandwidth, with peak emission achieved for nearly in-plane magnetic dynamics. Our findings establish magnetically driven HHG as a robust and tunable mechanism for nonlinear spin transport, governed by unique scaling laws with potential applications in ultrafast spintronic technologies.
Author: Ousmane Ly
Institution: Université de Nouakchott
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4415487288