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 for applying voltage to the first tubular carbon molecule; current-input means for inputting current to the second tubular carbon molecule; and current-output means for outputting current from the second tubular carbon molecule.