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

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arxiv 1003.2072 v1 pith:SLEQFO2E submitted 2010-03-10 cond-mat.mtrl-sci cond-mat.mes-hall

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

Niels Vandecasteele , Amelia Barreiro , Michele Lazzeri , Adrian Bachtold , Francesco Mauri This is my paper
classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords tunnelingzener-kleinalphacharacteristicscurrent-voltagedefectsdevicesgraphene
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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