Current-voltage characteristics of graphene devices: interplay between Zener-Klein tunneling and defects

Details Current-voltage characteristics of graphene devices: interplay between Zener-Klein tunneling and defects Current-voltage characteristics of graphene devices: interplay between Zener-Klein tunneling and defects

2010-03-10

arxiv.org/abs/1003.2072v1

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

We report a theoretical/experimental study of current-voltage characteristics (I-V) of graphene devices near the Dirac point. The I-V can be described by a power law (I \propto V^\alpha, with 1< \alpha <= 1.5). The exponent is higher when the mobility is lower. This superlinear I-V 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.

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