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We demonstrate that the interaction between excitons and a sea of incoherentelectrons does not preclude excitons dressing by light. We investigate the roleof exciton-electron scattering in the light dressing by measuring the dynamicalabsorption spectrum of a modulation-doped CdTe quantum well, which shows aclear evidence for significant electron scattering of the excitonic states. Weshow the occurrence of dressed and correlated excitons by detecting quantumcoherent interferences through excitonic Autler-Townes doublet and ac Starksplitting, which evolves to Mollow triplet with gain. We also evidence thepartial inhibition of the electron-exciton scattering by exciton-lightcoupling.

Light dressed-excitons in an incoherent-electron sea: Evidence for Mollow-triplet and Autler-Townes doublet