Experimental determination of the Berry phase in a superconducting charge pump

Mikko Möttönen, Juha Vartiainen, Jukka Pekola

Research output: Contribution to journalArticleScientificpeer-review

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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.
Original languageEnglish
Article number177201
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 28 Apr 2008
MoE publication typeA1 Journal article-refereed


  • Berry phase
  • Cooper pair pump
  • superconducting charge pump


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