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We study the localization of dressed Dirac electrons in a cylindrical quantumdot (QD) formed on monolayer and bilayer graphene by spatially differentpotential profiles. Short lived excitonic states which are too broad to beresolved in linear spectroscopy are revealed by cross peaks in the photon-echononlinear technique. Signatures of the dynamic gap in the two-dimensionalspectra are discussed. The effect of the Coulomb induced exciton-excitonscattering and the formation of biexciton molecules are demonstrated.

Trapping photon-dressed Dirac electrons in a quantum dot studied by coherent two dimensional photon echo spectroscopy