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We measured the temperature and fluence dependence of the time-resolvedphotoinduced optical reflectivity in a decagonal Al_{71.9}Ni_{11.1}Co_{17.0}quasicrystal. We find no evidence for the relaxation of a hot thermalizedelectron gas as observed in metals. Instead, a quick diffusion of the hotnonthermal carries ~40 nm into the bulk is detected enhanced by the presence ofa broad ~1 eV pseudogap. From the relaxation dynamics we find an evidence forthe presence of a fine structure in the electronic density of states around ~13meV from the Fermi energy. The structure is related to a weak bottleneck forthe carrier relaxation observed at low temperatures.

Fine structure in the electronic density of states of Al-Ni-Co decagonal quasicrystal from ultrafast time-resolved optical reflectivity