Journal
PHYSICAL REVIEW B
Volume 77, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.77.233402
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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.
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