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Probing ultrafast photo-induced dynamics of the exchange energy in a Heisenberg antiferromagnet

Probing ultrafast photo-induced dynamics of the exchange energy in a Heisenberg antiferromagnet

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BATIGNANI, Giovanni, Davide BOSSINI, N. DI PALO, Carino FERRANTE, Emanuele PONTECORVO, Giulio CERULLO, Aleksei V. KIMEL, Tullio SCOPIGNO, 2015. Probing ultrafast photo-induced dynamics of the exchange energy in a Heisenberg antiferromagnet. In: Nature Photonics. Springer Nature. 9, pp. 506-510. ISSN 1749-4885. eISSN 1749-4893. Available under: doi: 10.1038/nphoton.2015.121

@article{Batignani2015Probi-53336, title={Probing ultrafast photo-induced dynamics of the exchange energy in a Heisenberg antiferromagnet}, year={2015}, doi={10.1038/nphoton.2015.121}, volume={9}, issn={1749-4885}, journal={Nature Photonics}, pages={506--510}, author={Batignani, Giovanni and Bossini, Davide and Di Palo, N. and Ferrante, Carino and Pontecorvo, Emanuele and Cerullo, Giulio and Kimel, Aleksei V. and Scopigno, Tullio} }

Manipulating the macroscopic phases of solids using ultrashort light pulses has resulted in spectacular phenomena, including metal–insulator transitions1,2,3, superconductivity4 and subpicosecond modification of magnetic order5. The development of this research area strongly depends on the understanding and optical control of fundamental interactions in condensed matter, in particular the exchange interaction. However, disentangling the timescales relevant for the contributions of the exchange interaction and spin dynamics to the exchange energy, E<sub>ex</sub>, is a challenge. Here, we introduce femtosecond stimulated Raman scattering to unravel the ultrafast photo-induced dynamics of magnetic excitations at the edge of the Brillouin zone. We find that femtosecond laser excitation of the antiferromagnet KNiF<sub>3</sub> triggers a spectral shift of the two-magnon line, the energy of which is proportional to E<sub>ex</sub>. By unravelling the photo-induced modification of the two-magnon line frequency from a dominating nonlinear optical effect, we find that E<sub>ex</sub> is increased by the electromagnetic stimulus. Bossini, Davide Probing ultrafast photo-induced dynamics of the exchange energy in a Heisenberg antiferromagnet Pontecorvo, Emanuele 2015 Ferrante, Carino Batignani, Giovanni Bossini, Davide 2021-04-01T13:05:19Z Cerullo, Giulio Ferrante, Carino Di Palo, N. Cerullo, Giulio Di Palo, N. Scopigno, Tullio Kimel, Aleksei V. Kimel, Aleksei V. terms-of-use Scopigno, Tullio Pontecorvo, Emanuele eng 2021-04-01T13:05:19Z Batignani, Giovanni

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