Gate-defined graphene double quantum dot and excited state spectroscopy.Nano Lett. 2010 May 12; 10(5):1623-7.NL
A double quantum dot is formed in a graphene nanoribbon device using three top gates. These gates independently change the number of electrons on each dot and tune the interdot coupling. Transport through excited states is observed in the weakly coupled double dot regime. We extract from the measurements all relevant capacitances of the double dot system, as well as the quantized level spacing.