We report on a double quantum dot which is formed in a width-modulated etched bilayer graphene nanoribbon. A number of lateral graphene gates enable us to tune the quantum dot energy levels and the tunneling barriers of the device over a wide energy range. Charge stability diagrams and in particular individual triple point pairs allow to study the tunable capacitive inter-dot coupling energy as well as the spectrum of the electronic excited states on a number of individual triple points. We extract a mutual capacitive inter-dot coupling in the range of 2 - 6 meV and an inter-dot tunnel coupling on the order of 1.5 {\mu}eV.
@article{arxiv.1110.5803,
title = {Tunable capacitive inter-dot coupling in a bilayer graphene double quantum dot},
author = {Stefan Fringes and Christian Volk and Bernat Terrés and Jan Dauber and Stephan Engels and Stefan Trellenkamp and Christoph Stampfer},
journal= {arXiv preprint arXiv:1110.5803},
year = {2013}
}