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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.
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Submitted on : Friday, March 11, 2022 - 10:54:54 AM
Last modification on : Sunday, March 13, 2022 - 3:25:49 AM

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Niels Vandecasteele, Amelia Barreiro, Michele Lazzeri, Adrian Bachtold, Francesco Mauri. Current-voltage characteristics of graphene devices: Interplay between Zener-Klein tunneling and defects. Physical Review B, American Physical Society, 2010, 82, ⟨10.1103/PhysRevB.82.045416⟩. ⟨insu-03605308⟩

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