Modeling the Ultrafast Response of Two‐Magnon Raman Excitations in Antiferromagnets on the Femtosecond Timescale

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2019
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Batignani, Giovanni
Pontecorvo, Emanuele
Ferrante, Carino
Fumero, Giuseppe
Cerullo, Giulio
Mukamel, Shaul
Scopigno, Tullio
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Annalen der Physik. Wiley. 2019, 531(12), 1900439. ISSN 0003-3804. eISSN 1521-3889. Available under: doi: 10.1002/andp.201900439
Zusammenfassung

Illuminating a magnetic material with femtosecond laser pulses induces complex ultrafast dynamical processes. The resulting optically detectable response usually contains contributions from both the optical properties and the magnetic degrees of freedom. Disentangling all the different components concurring to the generation of the total signal is a major challenge of contemporary experimental solid‐state physics. Here, this problem is tackled, addressing the purely optical, nonmagnetic artifacts on the time resolved two‐magnon stimulated Raman spectrum of an antiferromagnet, rationalizing the recent observation on the exchange energy modification upon photo‐excitation. It is demonstrated how the genuine dynamics of the magnetic eigenmode can be disentangled from the nonlinear optical effects, generated by cross phase modulation, on the femtosecond timescale. The introduced approach can be extended for the investigation of <100 fs dynamic processes by means of coherent Raman scattering.

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ISO 690BATIGNANI, Giovanni, Emanuele PONTECORVO, Davide BOSSINI, Carino FERRANTE, Giuseppe FUMERO, Giulio CERULLO, Shaul MUKAMEL, Tullio SCOPIGNO, 2019. Modeling the Ultrafast Response of Two‐Magnon Raman Excitations in Antiferromagnets on the Femtosecond Timescale. In: Annalen der Physik. Wiley. 2019, 531(12), 1900439. ISSN 0003-3804. eISSN 1521-3889. Available under: doi: 10.1002/andp.201900439
BibTex
@article{Batignani2019Model-53321,
  year={2019},
  doi={10.1002/andp.201900439},
  title={Modeling the Ultrafast Response of Two‐Magnon Raman Excitations in Antiferromagnets on the Femtosecond Timescale},
  number={12},
  volume={531},
  issn={0003-3804},
  journal={Annalen der Physik},
  author={Batignani, Giovanni and Pontecorvo, Emanuele and Bossini, Davide and Ferrante, Carino and Fumero, Giuseppe and Cerullo, Giulio and Mukamel, Shaul and Scopigno, Tullio},
  note={Article Number: 1900439}
}
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