Experimental determination of the Berry phase in a superconducting charge pump

Details Experimental determination of the Berry phase in a superconducting charge pump Experimental determination of the Berry phase in a superconducting charge pump

2007-10-30

arxiv.org/abs/0710.5623v2

Phys. Rev. Lett. 100, 177201 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.100.177201

We present the first measurements of the Berry phase in a superconducting Cooper pair pump. A fixed amount of Berry phase is accumulated to the quantum-mechanical ground state in each adiabatic pumping cycle, which is determined by measuring the charge passing through the device. The dynamic and geometric phases are identified and measured quantitatively from their different response when pumping in opposite directions. Our observations, in particular, the dependencies of the dynamic and geometric effects on the superconducting phase bias across the pump, agree with the basic theoretical model of coherent Cooper pair pumping.

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