Operating a quantum pump in a closed circuit (2002-2006)
During an adiabatic pumping cycle a conventional two barrier quantum device
takes an electron from the left lead and ejects it to the right lead. Hence the
pumped charge per cycle is naively expected to be Q < e. This zero order
adiabatic point of view is in fact misleading. For a closed device we can get
Q > e and even Q >> e. Using the Kubo formula for the geometric
conductance, and applying the Dirac chains picture, we derive practical
estimates for Q.
[1] I. Sela and D. Cohen, J. Phys. A 39, 3575
(2006).
[arXiv]
[pdf]
[2] D. Cohen, Phys. Rev. B 68, 201303(R)
(2003).
[arXiv]
[pdf]
[3] D. Cohen, Phys. Rev. B 68, 155303
(2003).
[arXiv]
[pdf]
[4] D. Cohen
(2002).
[arXiv]
[pdf]