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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.06587 |
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| _version_ | 1866909607028326400 |
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| author | Qian, Chen Lu, Ruifeng |
| author_facet | Qian, Chen Lu, Ruifeng |
| contents | We report a strong-field detection method for magnetic materials, based on the characterization of crystal time-reversal symmetry through the elliptical dichroism of harmonics. The consistency of the low-order harmonics driven by laser fields with opposite helicities originates from the time-reversal symmetry of crystals, and thus the appearance of harmonic elliptical dichroism can serve as evidence for the breaking of crystal time-reversal symmetry. We have used the semiconductor Bloch equation to calculate the harmonic spectra of the bilayer ferromagnetic material Cr2Ge2Te6, with and without spin-orbit coupling. In magnetic materials, strong spin-orbit coupling causes the loss of time-reversal symmetry in the phase of polarization currents between different spin states, inducing elliptical dichroism in the harmonics. Here we extend the magneto-optical Faraday or Kerr effect to the nonlinear domain using strong laser fields, improving the sensitivity and applicability of magneto-optical detection methods. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_06587 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Effectively nonlinear magneto-optical detection under strong laser fields Qian, Chen Lu, Ruifeng Optics We report a strong-field detection method for magnetic materials, based on the characterization of crystal time-reversal symmetry through the elliptical dichroism of harmonics. The consistency of the low-order harmonics driven by laser fields with opposite helicities originates from the time-reversal symmetry of crystals, and thus the appearance of harmonic elliptical dichroism can serve as evidence for the breaking of crystal time-reversal symmetry. We have used the semiconductor Bloch equation to calculate the harmonic spectra of the bilayer ferromagnetic material Cr2Ge2Te6, with and without spin-orbit coupling. In magnetic materials, strong spin-orbit coupling causes the loss of time-reversal symmetry in the phase of polarization currents between different spin states, inducing elliptical dichroism in the harmonics. Here we extend the magneto-optical Faraday or Kerr effect to the nonlinear domain using strong laser fields, improving the sensitivity and applicability of magneto-optical detection methods. |
| title | Effectively nonlinear magneto-optical detection under strong laser fields |
| topic | Optics |
| url | https://arxiv.org/abs/2505.06587 |