Single and coupled quantum dots have been fabricated in single-wall carbon nanotubes, and their electrical transport has been measured at low temperatures. Electrical contacts to individual nanotubes as well as gates have been formed using mark alignment technique in electron beam lithography. We show the operation of a single electron transistor, and discuss it with the orthodox model of the Coulomb blockade with well-defined confined states. Some devices show the multi-dot behavior, which is confirmed by the Stochastic Coulomb blockade. Classical response of the single quantum dot to the microwave irradiation is described, and the preliminary results on the formation of coupled quantum dots are shown.
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