Hidden quantum pump effects in quantum coherent rings

Details Hidden quantum pump effects in quantum coherent rings Hidden quantum pump effects in quantum coherent rings

2003-02-27

arxiv.org/abs/cond-mat/0302586v1

Phys. Rev. B v.68, 075303 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 5 figures

Scientific paper

10.1103/PhysRevB.68.075303

Time periodic perturbations of an electron system on a ring are examined. For small frequencies periodic small amplitude perturbations give rise to side band currents which in leading order are inversely proportional to the frequency. These side band currents compensate the current of the central band such that to leading order no net pumped current is generated. In the non-adiabatic limit, larger pump frequencies can lead to resonant excitations: as a consequence a net pumped current arises. We illustrate our results for a one channel ring with a quantum dot whose barriers are modulated parametrically.

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