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Signatures of relativistic spin-light coupling in magneto-optical pump-probe experiments

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2017

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Berritta, Marco
Oppeneer, Peter M.

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https://doi.org/10.1088/1361-648X/aa68ea
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Journal of Physics : Condensed Matter. 2017, 29(19), 194002. ISSN 0953-8984. eISSN 1361-648X. Available under: doi: 10.1088/1361-648X/aa68ea

Zusammenfassung

Femtosecond magneto-optical pump-probe measurements of ultrafast demagnetization show an intriguing difference in the first 100 fs of the magneto-optical Kerr response depending on whether the polarization of the pump and probe beams are in parallel or perpendicular configuration (Bigot et al 2009 Nat. Phys. 5 515). Starting from a most general relativistic Hamiltonian we focus on the ultra-relativistic light-spin interaction and show that this coupling term leads to different light-induced opto-magnetic fields when pump and probe polarization are parallel and perpendicular to each other, providing thus an explanation for the measurements. We also analyze other pump-probe configurations where the pump laser is circularly polarized and the employed probe contains only linearly polarized light and show that similar opto-magnetic effects can be anticipated.

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ISO 690MONDAL, Ritwik, Marco BERRITTA, Peter M. OPPENEER, 2017. Signatures of relativistic spin-light coupling in magneto-optical pump-probe experiments. In: Journal of Physics : Condensed Matter. 2017, 29(19), 194002. ISSN 0953-8984. eISSN 1361-648X. Available under: doi: 10.1088/1361-648X/aa68ea
BibTex
@article{Mondal2017-05-17Signa-46181,
  year={2017},
  doi={10.1088/1361-648X/aa68ea},
  title={Signatures of relativistic spin-light coupling in magneto-optical pump-probe experiments},
  number={19},
  volume={29},
  issn={0953-8984},
  journal={Journal of Physics : Condensed Matter},
  author={Mondal, Ritwik and Berritta, Marco and Oppeneer, Peter M.},
  note={Article Number: 194002}
}
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