Quantum pumping: Coherent Rings versus Open Conductors

Details Quantum pumping: Coherent Rings versus Open Conductors Quantum pumping: Coherent Rings versus Open Conductors

2003-07-28

arxiv.org/abs/cond-mat/0307675v1

Phys. Rev. B 68, 161311 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.68.161311

We examine adiabatic quantum pumping generated by an oscillating scatterer embedded in a one-dimensional ballistic ring and compare it with pumping caused by the same scatterer connected to external reservoirs. The pumped current for an open conductor, paradoxically, is non-zero even in the limit of vanishing transmission. In contrast, for the ring geometry the pumped current vanishes in the limit of vanishing transmission. We explain this paradoxical result and demonstrate that the physics underlying adiabatic pumping is the same in open and in closed systems.

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