Signatures of Ultrafast Reversal of Excitonic Order in Ta_{2}NiSe_{5}.

@article{Ning2020SignaturesOU,
  title={Signatures of Ultrafast Reversal of Excitonic Order in Ta\_\{2\}NiSe\_\{5\}.},
  author={H. Ning and O. Mehio and M. Buchhold and T. Kurumaji and G. Refael and J. Checkelsky and D. Hsieh},
  journal={Physical review letters},
  year={2020},
  volume={125 26},
  pages={
          267602
        }
}
In the presence of electron-phonon coupling, an excitonic insulator harbors two degenerate ground states described by an Ising-type order parameter. Starting from a microscopic Hamiltonian, we derive the equations of motion for the Ising order parameter in the phonon coupled excitonic insulator Ta_{2}NiSe_{5} and show that it can be controllably reversed on ultrashort timescales using appropriate laser pulse sequences. Using a combination of theory and time-resolved optical reflectivity… Expand
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