Abstract
Carbon nanotubes are ideal systems to explore the physics of 1‐dimensional materials. At low temperatures carbon nanotubes exhibit a variety of phenomena, such as Coulomb blockade, quantum interference and the Kondo effect. So far these observations have been made mainly in metallic nanotubes. Of particular interest is the study of electronic transport in nanotube quantum dots, where information about the quantized energy levels can be obtained. Despite some studies at intermediate temperatures, semiconducting nanotube single quantum dots have been proven difficult to realize at low temperatures preventing, for example, the observation of the electronic spectrum. Here we show that semiconducting individual single‐walled carbon nanotubes can behave as fully coherent single quantum dots operating both in the few‐electron and few‐hole regime. We find that the discrete excitation spectrum for a nanotube with N holes is strikingly similar to the corresponding spectrum for N electrons. The data indicate a near‐perfect electron‐hole symmetry as well as the absence of scattering in semiconducting carbon nanotubes.
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