Quantum pump effect in one-dimensional systems of Dirac fermions

Details Quantum pump effect in one-dimensional systems of Dirac fermions Quantum pump effect in one-dimensional systems of Dirac fermions

2007-04-18

arxiv.org/abs/0704.2329v1

Phys. Rev. B 76, 165401, (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 5 figures

Scientific paper

10.1103/PhysRevB.76.165401

We investigate the behavior of the directed current in one-dimensional systems of Dirac fermions driven by local periodic potentials in the forward as well in backscattering channels. We treat the problem with Keldysh non-equilibrium Green's function formalism. We present the exact solution for the case of an infinite wire and show that in this case the dc current vanishes identically. We also investigate a confined system consistent in an annular arrangement coupled to a particle reservoir. We present a perturbative treatment that allows for the analytical expressions of the dc current in the lowest order of the amplitudes of the potential. We also present results obtained from the exact numerical solution of the problem.

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