Science Advances

Supplementary Materials

This PDF file includes:

  • Section S1. KK analyses of reflectivity spectra
  • Section S2. Electric field dependence of electric field–induced reflectivity changes
  • Section S3. Analyses of electric field–induced reflectivity changes
  • Section S4. Transient reflectivity changes by the THz pulse and their analyses in La2CuO4 and Sr2CuO2Cl2
  • Section S5. Contributions of continuum states on Reχ(3)(−ω; 0, 0, ω) and Imχ(3)(−ω; 0, 0, ω) spectra in Sr2CuO2Cl2
  • Fig. S1. Comparison of polarized absorption (α) spectra with the electric fields of lights parallel to the a axis.
  • Fig. S2. Electric field dependence of reflectivity changes ΔR(0)/R at the time origin in Sr2CuO2Cl2.
  • Fig. S3. Reχ(3)(−ω; 0, 0, ω) and Imχ(3)(−ω; 0, 0, ω) spectra and their analyses in Nd2CuO4.
  • Fig. S4. Transient reflectivity changes in La2CuO4 and Sr2CuO2Cl2.
  • Fig. S5. Reχ(3)(−ω; 0, 0, ω) and Imχ(3)(−ω; 0, 0, ω) spectra and their analyses in La2CuO4 and Sr2CuO2Cl2.
  • Fig. S6. Comparison of the fitting analyses of Reχ(3)(−ω; 0, 0, ω) and Imχ(3)(−ω; 0, 0, ω) spectra with three-, four-, and five-level models in Sr2CuO2Cl2.
  • Table S1. Parameter values with errors obtained from the fitting analyses on the ε2 spectra.
  • Table S2. Parameter values with errors obtained from the fitting analyses on the Reχ(3)(−ω; 0, 0, ω) and Imχ(3)(−ω; 0, 0, ω) spectra.
  • Table S3. Parameter values obtained from the fitting analyses with three-, four-, and five-level models in Sr2CuO2Cl2.
  • Table S4. Products of dipole moments associated with nonlinear optical spectra in Sr2CuO2Cl2.
  • References (47, 48)

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