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We have measured the differential conductance of a  parallel carbon nanotube (CNT) double quantum dot (DQD) with strong  inter‐dot capacitance and inter‐dot tunnel coupling. Nominally, the  device consists of a single CNT with two contacts. However, we  identify two sets of Coulomb blockade (CB) diamonds that do not  block transport individually, which suggest that two quantum dots  (QDs) are contacted in parallel. We find strong and periodic  anti‐crossings in the gate and bias dependence, which are only  possible if the QDs have similar characteristics. We discuss  qualitatively the level spectrum and the involved transport  processes in this device and extract the DQD coupling parameters.  These results lead us to believe that clean and undoped QDs are  formed parallel to the CNT axis, possibly on the outer and inner  shells of a multi‐wall CNT, or in a double‐stranded CNT bundle.

Full characterization of a carbon nanotube parallel double quantum dot