Valley-valve effect and even-odd chain parity in graphene junctions
Physical Review B—Condensed Matter and Materials Physics, 2008•APS
We address the current blocking by ap-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.
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.
We address the current blocking by a 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 and the 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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