Coherent generation of symmetry-forbidden phonons by light-induced electron-phonon interactions in magnetite

@article{Borroni2015CoherentGO,
  title={Coherent generation of symmetry-forbidden phonons by light-induced electron-phonon interactions in magnetite},
  author={S Borroni and Edoardo Baldini and Vamshi M. Katukuri and Andreas Mann and Krzysztof Parlinski and Dominik Legut and C A Arrell and F. van Mourik and J{\'e}r{\'e}mie Teyssier and A. Kozłowski and Przemysław Piekarz and Oleg V. Yazyev and Andrzej M. Ole's and Jos{\'e} Lorenzana and Fabrizio Carbone},
  journal={Physical Review B},
  year={2015},
  volume={96},
  pages={104308}
}
Symmetry breaking across phase transitions often causes changes in selection rules and emergence of optical modes which can be detected via spectroscopic techniques or generated coherently in pump-probe experiments. In second-order or weakly first-order transitions, fluctuations of the ordering field are present above the ordering temperature, giving rise to intriguing precursor phenomena, such as critical opalescence. Here, we demonstrate that in magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4… 

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