Effect of Klein tunneling on conductance and shot noise in ballistic graphene

Details Effect of Klein tunneling on conductance and shot noise in ballistic graphene Effect of Klein tunneling on conductance and shot noise in ballistic graphene

2009-02-20

arxiv.org/abs/0902.3622v2

Phys. Rev. B 79, 195438 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 6 figures, typos corrected

Scientific paper

The conductance and the Fano factor in a graphene sheet in the ballistic regime are calculated. The electrostatic potential in the sheet is modeled by a trapezoid barrier, which allows to use the exact solution of the Dirac equation in a uniform electric field in the slope areas (the two lateral sides of the trapezoid). A special attention is devoted to asymmetry with respect to the sign of the gate voltage, which is connected with the difference between the Klein tunneling and the over-barrier reflection. The comparison of the developed theory with the experiment supports the conclusion that the Klein tunneling was revealed experimentally.

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