Quantum pumping in graphene nanoribbons at resonant transmission

Details Quantum pumping in graphene nanoribbons at resonant transmission Quantum pumping in graphene nanoribbons at resonant transmission

2010-12-10

arxiv.org/abs/1012.2221v1

EPL, 92 (2010) 47010

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures. This is an author-created, un-copyedited version of an article accepted for publication in EPL. IOP Publis

Scientific paper

10.1209/0295-5075/92/47010

Adiabatic quantum charge pumping in graphene nanoribbon double barrier structures with armchair and zigzag edges in the resonant transmission regime is analyzed. Using recursive Green's function method we numerically calculate the pumped charge for pumping contours encircling a resonance. We find that for armchair ribbons the whole resonance line contributes to the pumping of a single electron (ignoring double spin degeneracy) per cycle through the device. The case of zigzag ribbons is more interesting due to zero-conductance resonances. These resonances separate the whole resonance line into several parts, each of which corresponds to the pumping of a single electron through the device. Moreover, in contrast to armchair ribbons, one electron can be pumped from the left lead to the right one or backwards. The current direction depends on the particular part of the resonance line encircled by the pumping contour.

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