Large peak-to-valley ratio of negative-differential-conductance in graphene p-n junctions

Details Large peak-to-valley ratio of negative-differential-conductance in graphene p-n junctions Large peak-to-valley ratio of negative-differential-conductance in graphene p-n junctions

2011-05-06

arxiv.org/abs/1105.1283v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

We investigate the transport characteristics of monolayer graphene p-n junctions by means of the non-equilibrium Green's function technique. It is shown that thanks to the high interband tunneling of chiral fermions and to a finite bandgap opening when the inversion symmetry of graphene plane is broken, a strong negative-differential-conductance behavior with peak-to-valley ratio as large as a few tens can be achieved even at room temperature. The dependence of this behavior on the device parameters such as the Fermi energy, the barrier height, and the transition length is then discussed.

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