Tunable capacitive inter-dot coupling in a bilayer graphene double   quantum dot
  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. 
Stefan Fringes, Christian Volk, Bernat Terr\'es, Jan Dauber, Stephan   Engels, Stefan Trellenkamp, and Christoph Stampfer
cond-mat.mes-hall