Conductance of highly oriented pyrolytic graphite nanocontacts

The conductance-voltage G(V) characteristics for contacts between electrodes of highly oriented pyrolytic graphite were studied in a wide range of G(0), bias voltages, and temperatures using the mechanically controllable break junction technique. Our results show a striking resemblance to corresponding data for conducting multiwall carbon nanotubes. For high-ohmic contacts between a single or a few graphene sheets, zero bias anomalies related to strong e–e Coulomb interactions and quantum interference of electrons is observed.