Current-voltage characteristics of graphene devices: Interplay between Zener-Klein tunneling and defects
Abstract
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∝Vα with 1<α≤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.
- Publication:
-
Physical Review B
- Pub Date:
- July 2010
- DOI:
- 10.1103/PhysRevB.82.045416
- arXiv:
- arXiv:1003.2072
- Bibcode:
- 2010PhRvB..82d5416V
- Keywords:
-
- 72.80.Rj;
- 72.10.Fk;
- 73.50.Dn;
- 73.61.Wp;
- Fullerenes and related materials;
- Scattering by point defects dislocations surfaces and other imperfections;
- Low-field transport and mobility;
- piezoresistance;
- Condensed Matter - Materials Science;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 5 pages, 3 figures