Abstract
We report a theoretical/experimental study of current-voltage characteristics of graphene devices near the Dirac point. The can be described by a power law ( with ). The exponent is higher when the mobility is lower. This superlinear is interpreted in terms of the interplay between Zener-Klein transport, that is tunneling between different energy bands, and defect scattering. Surprisingly, the Zener-Klein tunneling is made visible by the presence of defects.
5 More- Received 2 October 2009
DOI:https://doi.org/10.1103/PhysRevB.82.045416
©2010 American Physical Society