Tunable Coulomb blockade in nanostructured graphene

C. Stampfer, J. Guettinger, F. Molitor, D. Graf, T. Ihn, K. Ensslin

Published 2007-09-24Version 1

We report on Coulomb blockade and Coulomb diamond measurements on an etched, tunable single-layer graphene quantum dot. The device consisting of a graphene island connected via two narrow graphene constrictions is fully tunable by three lateral graphene gates. Coulomb blockade resonances are observed and from Coulomb diamond measurements a charging energy of ~3.5 meV is extracted. For increasing temperatures we detect a peak broadening and a transmission increase of the nanostructured graphene barriers.