We consider adiabatic pumping of electrons through a quantum dot. There are
two ways to operate the pump: to create a dc current Iˉ or to create a
dc voltage Vˉ. We demonstrate that, for very slow pumping, Iˉ
and Vˉ are not simply related via the dc conductance G as Iˉ=VˉG. For the case of a chaotic quantum dot, we consider the statistical
distribution of VˉG−Iˉ. Results are presented for the limiting
cases of a dot with single channel and with multichannel point contacts.Comment: 6 pages, 4 figure