1. An electronic device comprising: a first tubular carbon molecule; a second tubular carbon molecule wherein the second tubular carbon molecule is disposed substantially in parallel with the first tubular carbon molecule, partially covers the first tubular carbon molecule, and has semiconductivity; voltage-applying means in contact with the first tubular carbon molecule, wherein the voltage-applying means is configured to apply voltage to the first tubular carbon molecule to control operation of a conduction channel formed in the second tubular carbon molecule between current-input means and current-output means; the current-input means for inputting current to the second tubular carbon molecule; and the current-output means for outputting current from the second tubular carbon molecule.