Adiabatic quantum pumping at the Josephson frequency.
We analyze theoretically adiabatic quantum pumping through a normal conductor that couples the normal regions of two superconductor - normal-metal - superconductor Josephson junctions. By using the phases of the superconducting order parameter in the superconducting contacts as pumping parameters, we demonstrate that a nonzero pumped charge can flow through the device. The device exploits the evolution of the superconducting phases due to the ac Josephson effect, and can therefore be operated at very high frequency, resulting in a pumped current as large as a few nanoamperes. The experimental relevance of our calculations is discussed.
Russo
S
S
Kavli Institute of Nanoscience, Faculty of Applied Science, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands.
Tobiska
J
J
Klapwijk
T M
TM
Morpurgo
A F
AF
D008670:Metals
D008670:Metals