From adiabatic to non-adiabatic pumping in graphene nanoribbons

Details From adiabatic to non-adiabatic pumping in graphene nanoribbons From adiabatic to non-adiabatic pumping in graphene nanoribbons

2012-03-18

arxiv.org/abs/1203.3952v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

Non-equilibrium two-parameter pumping transport through graphene ribbons, attached to reservoirs is described. A tight-binding model is solved using Keldysh formalism, and the crossover between adiabatic and non-adiabatic regimes is studied. Pumped dc currents through armchair ribbons show properties common in two-dimensional systems. The width-dependent dc current in zigzag ribbons, reveals that edge states akin to those in two-dimensional topological insulators, do not contribute to pumped transport in the adiabatic regime. The interplay between propagating and evanescent modes is discussed.

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