  Carbon-based nanostructures have unparalleled electronic properties. At the
same time, using an allotrope of carbon as the contacts can yield better device
control and reproducibility. In this work, we simulate a single-electron
transistor composed of a segment of a graphene nanoribbon coupled to carbon
nanotubes electrodes. Using the non-equilibrium Green's function formalism we
atomistically describe the electronic transport properties of the system
including electron-electron interactions. Using this methodology we are able to
recover experimentally observed phenomena, such as the Coulomb blockade, as
well as the corresponding Coulomb diamonds. Furthermore, we are able to
separate the different contributions to transport and show that incoherent
effects due to the interaction play a crucial role in the transport properties
depending on the region of the stability diagram being considered.
