Extended Data Fig. 5: Polarization-resolved Raman spectroscopy of the strain FePSe3 sample.
From: Strain tuning of vestigial three-state Potts nematicity in a correlated antiferromagnet
a, Raman response of a thin-bulk flake at two thermal points. Labelled peaks (P1, P2, and P3) correspond to Raman modes associated with the zigzag AFM order. b, c, Co-linearly polarized Raman scattering as the incident polarization is rotated for compressive (−120 V) and tensile (90 V) strain, respectively. d, e, Polar plot of the integrated intensity of the Raman mode labelled P1 superimposed onto zigzag orders at compressive (d) and tensile (e) strain. P1 Raman mode exhibits a four-fold symmetry that is rotationally separated by π/4 with respect to the zigzag order. Thus, a 2π/3-shift in the zigzag order would result in a π/6-shift in the incident polarization dependence of the Raman mode.
