Figure 3
(a) Numerical derivative of the current as a function of the source-drain bias voltage. Coulomb diamonds are observed. (b,c) Schematic of the one possible configuration of the quantum dots (c) and the expected Coulomb diamonds (b). Electrostatic potential will be disordered by the impurities and defects and the quantum dots are formed at the potential minima. Here we assumed that three and four quantum dots are coupled in series, and these are coupled in parallel. The overlapped Coulomb diamonds show gaps around the zero bias conditions.
