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We discuss how Raman spectra are affected by nearly-critical spin and chargecollective modes, which are coupled to charge carriers near a stripe quantumcritical point. We show that specific fingerprints of nearly-criticalcollective modes can indeed be observed in Raman spectra and that theselectivity of Raman spectroscopy in momentum space may also be exploited todistinguish the spin and charge contribution. We apply our results to discussthe spectra of high-Tc superconducting cuprates finding that the collectivemodes should have masses with substantial temperature dependence in agreementwith their nearly critical character. Moreover spin modes should be morediffusive than charge modes indicating that in stripes the charge is nearlyordered, while spin modes are strongly overdamped and fluctuate with highfrequency.

On the contribution of nearly-critical spin and charge collective modes to the Raman spectra of high-Tc cuprates