Abstract
Suspended graphene nanoribbons formed during current annealing of suspended graphene flakes have been investigated experimentally. Transport measurements show the opening of a transport gap around charge neutrality due to the formation of “Coulomb islands”, coexisting with quantum Hall conductance plateaus appearing at moderate values of the magnetic field . Upon increasing , the transport gap is rapidly suppressed, and is taken over by a much larger energy gap due to electronic correlations. Our observations show that suspended nanoribbons allow the investigation of phenomena that could not so far be accessed in ribbons on substrates.
- Received 2 March 2012
DOI:https://doi.org/10.1103/PhysRevLett.108.266601
© 2012 American Physical Society