Science Advances

Supplementary Materials

This PDF file includes:

  • section S1. Thermal heating and excitation transport
  • section S2. Time and frequency resolution in the optical-pump terahertz probe experiments
  • fig. S1. Optical-pump terahertz-probe scheme.
  • fig. S2. Energy level scheme and couplings used in the simulation.
  • fig. S3. Simulated transient terahertz spectra resulting from different probe schemes.
  • fig. S4. Equilibrium optical reflectivity around the bending mode of La1.75Sr0.25NiO4.
  • fig. S5. Temperature dependence of the sharp modes below TCO.
  • fig. S6. Fluence dependence of the mid-IR pseudogap dynamics.
  • fig. S7. Dynamics of the ω3 zone-folded vibrational mode.
  • fig. S8. Dynamics of the q = 0 bending phonon mode.
  • fig. S9. Model comparison for the TO mode dynamics.
  • References (38–46)

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