We address the current blocking by a p-n junction in a zigzag graphene ribbon by means of numerical and analytic investigations. Ribbons with superimposed gate potentials perfectly block the current in the energy range, where a single energy band is active in both the n and the p regions, if the number of carbon chains is even. In the same conditions, an odd number of chains allows current transmission. We interpret this even-odd valley-valve effect in terms of the underlying honeycomb topology and crystal structure symmetry.

Valley-valve effect and even-odd chain parity in p-n graphene junctions

GROSSO, GIUSEPPE;
2008-01-01

Abstract

We address the current blocking by a p-n junction in a zigzag graphene ribbon by means of numerical and analytic investigations. Ribbons with superimposed gate potentials perfectly block the current in the energy range, where a single energy band is active in both the n and the p regions, if the number of carbon chains is even. In the same conditions, an odd number of chains allows current transmission. We interpret this even-odd valley-valve effect in terms of the underlying honeycomb topology and crystal structure symmetry.
2008
Cresti, A; Grosso, Giuseppe; Pastori Parravicini, G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/125420
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