Non-equilibrium anti-Stokes Raman spectroscopy for investigating Higgs modes in superconductors

Raman instrument

Spontaneous Raman measurements were performed on the UT-3 Raman spectrometer (see Fig. S1)⁴⁶. This triple-grated spectrometer is fully achromatic due to the use of reflective optics. Excellent stray light rejection is achieved…