Scaling Laws of Magnetically Driven High-order Harmonic Generation in Spin-Orbit Coupled Systems
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866915555851632640 |
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| author | Ly, Ousmane |
| author_facet | Ly, Ousmane |
| contents | 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 Rashba spin-orbit interaction: the harmonic cutoff $n_{\mathrm{max}}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_02619 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Scaling Laws of Magnetically Driven High-order Harmonic Generation in Spin-Orbit Coupled Systems Ly, Ousmane Mesoscale and Nanoscale Physics 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 Rashba spin-orbit interaction: the harmonic cutoff $n_{\mathrm{max}}$ 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. |
| title | Scaling Laws of Magnetically Driven High-order Harmonic Generation in Spin-Orbit Coupled Systems |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2304.02619 |