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Experimental Determination of the Berry Phase in a Superconducting Charge Pump

Mikko Möttönen, Juha J. Vartiainen, and Jukka P. Pekola
Phys. Rev. Lett. 100, 177201 – Published 28 April 2008
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Abstract

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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  • Received 7 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.177201

©2008 American Physical Society

Authors & Affiliations

Mikko Möttönen1,2,*, Juha J. Vartiainen1, and Jukka P. Pekola1

  • 1Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 3500, 02015 TKK, Finland
  • 2Department of Engineering Physics/COMP, Helsinki University of Technology, P. O. Box 5100, 02015 TKK, Finland

  • *mikko.mottonen@tkk.fi

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Issue

Vol. 100, Iss. 17 — 2 May 2008

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