Measurement scheme of the Berry phase in superconducting circuits

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2006
Major/Subject
Mcode
Degree programme
Language
en
Pages
214523/1-10
Series
Physical Review B, Volume 73, Issue 21
Abstract
We present a measurement scheme for observing the Berry phase in a flux assisted Cooper pair pump—the Cooper pair sluice. In contrast to the recent experiments, in which the sluice was employed to generate accurate current through a resistance, we consider a device in a superconducting loop. This arrangement introduces a connection between the pumped current and the Berry phase accumulated during the adiabatic pumping cycles. From the adiabaticity criterion, we derive equations for the maximum pumped current and optimize the sluice accordingly. These results apply also to the high accuracy pumping which results in a potential candidate for a metrological current standard. For measuring the pumped current, an additional Josephson junction is installed into the superconducting loop. We show in detail that the switching of this system from superconducting state into normal state as a consequence of an external current pulse through it may be employed to probe the pumped current. To our knowledge the experimental realization of our scheme would be the first observation of the Berry phase in superconducting circuits.
Description
Keywords
Berry phase, Josephson devices, Cooper pair pumping
Other note
Citation
Möttönen, Mikko & Pekola, Jukka & Vartiainen, Juha J. & Brosco, Valentina & Hekking, Frank W. J. 2006. Measurement scheme of the Berry phase in superconducting circuits. Physical Review B. Volume 73, Issue 21. 214523/1-10. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.73.214523.