Fig. 5: Linear polarization-dependent Raman and PL results for x = 0.03.

a Schematic representation of the experimental setup for linearly polarized Raman and PL measurements with polarization directions of incident and scattered light. b, c Intensity polar plot for the Raman phonons \({B}_{g}^{1}\) and \({B}_{g}^{2}(1,2)\) for \(x=0.03\), collected at \(3.5\,{\rm{K}}\) in the parallel configuration (\({\hat{e}}_{i}\parallel {\hat{e}}_{s}\)), after the corrections of the initial orientation of the crystal axis, respectively. d PL spectra for \({\hat{e}}_{i}\parallel {\hat{e}}_{s}\) (red) and \({\hat{e}}_{i}\perp {\hat{e}}_{s}\) (black) for \(x=0.03\) at \(3.5\,{\rm{K}}\). e, f Intensity polar plot of the excitonic peaks \({X}_{Z{R}_{2}}\) and \({X}_{Z{R}_{1}}\) for \(x=0.03\) in the parallel configuration at 3.5 K, after correcting the initial crystal axis orientation, respectively. The red arrows in (f) and (e) represent the Néel vector, which aligns along the a-axis. The angular dependence of the \({B}_{g}^{2}(1)\) an \({B}_{g}^{2}(2)\) intensities are described by \(I(\theta )={e}^{2}{\cos }^{2}(2\theta )\) and \(I(\theta )={e}^{2}{\sin }^{2}(2\theta )\), respectively, while the excitonic peaks \({X}_{Z{R}_{2}}\) and \({X}_{Z{R}_{1}}\) follow \(I(\theta )={I}_{0}{\sin }^{2}(\theta )\).