Pipeline model of a Fermi-sea electron pump

Details Pipeline model of a Fermi-sea electron pump Pipeline model of a Fermi-sea electron pump

2000-06-21

arxiv.org/abs/cond-mat/0006329v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages in RevTex4 (beta4), 4 figures; status: accepted for publication reason for replacement: A more detailed discussion of

Scientific paper

10.1002/1521-3889(200010)9:9/10<

The use of a band offset between the two leads of an electron pump driven by a local oscillating voltage is shown to increase the pump current dramatically. The structure of the electron transmission suggests the existence of dominant inelastic channels which we call pipelines. This permits the formulation of a simple model that gives a physical account of the numerical results for a realistic device. A spectral analysis reveals the pump current to be carried by scattering states with initial energy deep within the Fermi sea and not at its surface, thereby rendering the effect insensitive to temperature. We show this is compatible with the current flowing near the Fermi surface in the leads.

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