Nature of the 175-180 cm$^{-1}$ Raman Feature in Altermagnetic $α$-MnTe

The 175 cm$^{-1}$ Raman mode in $α$-MnTe has long been assigned to the material's only symmetry-allowed phonon ($E_{2g}$), yet first-principles calculations consistently place this mode below 100 cm$^{-1}$. Recent works have offered three competing explanations for the discrepancy: a weak symmetry-l