Under resonant excitation near the dark A exciton, all Raman modes in few-layer WS2 become parallel-polarized and forbidden modes appear, explained by intraband Fröhlich interaction that makes the Raman tensor a scalar.
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Breakdown of Raman Selection Rules By Fr\"{o}hlich Interaction in Few-Layer WS$_2$
Under resonant excitation near the dark A exciton, all Raman modes in few-layer WS2 become parallel-polarized and forbidden modes appear, explained by intraband Fröhlich interaction that makes the Raman tensor a scalar.