Experimental Determination of the Berry Phase in a Superconducting Charge Pump
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Physical Review Letters, Volume 100, Issue 17
AbstractWe 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.
Cooper pair pumps, Berry phase, superconducting charge pumps
Möttönen, Mikko & Vartiainen, Juha J. & Pekola, Jukka. 2008. Experimental Determination of the Berry Phase in a Superconducting Charge Pump. Physical Review Letters. Volume 100, Issue 17. P. 177201/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.100.177201.