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

  title={Current-voltage characteristics of graphene devices: Interplay between Zener-Klein tunneling and defects},
  author={Niels Vandecasteele and Amelia Barreiro and Michele Lazzeri and Adrian Bachtold and Francesco Mauri},
  journal={Physical Review B},
Here, we argue that Zener-Klein tunneling can be observed in graphene with the most common device layout undoped, four-point 4pt configuration, and without any local gates by simply measuring the I-V at room temperature. On the basis of theoretical arguments, in graphene, the ZK current is expected to manifest itself with a superlinear current I V with =1.5. The basic concepts can be understood with a semiclassical treatment which, in the case of ballistic transport, allows us to write an… 

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