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We report optical studies of quantum dot excitons in individual suspendedcarbon nanotubes at cryogenic temperatures. Narrow optical linewidths, stronglysuppressed spectral wandering, and photoluminescence lifetimes in the range ofnanoseconds emerge as key signatures of exciton localization. We infer excitonquantum dot formation with a characteristic length of a few exciton Bohr radii.Localization inhibits exciton diffusion and protects the exciton from dephasingby structural or environmental inhomogeneities as well as from exploringnonradiative quenching sites. In consequence, quantum dot excitons in carbonnanotubes exhibit intrinsic radiative lifetimes, long coherence times and aquantum yield of 100%. Our results underpin the potential of carbon nanotubeexcitons for both fundamental studies and applications that scaleadvantageously with enhanced spectral resolution and coherence.

Optical signatures of quantum dot excitons in carbon nanotubes