Experimental observation of the breaking and recombination of single Cooper pairs
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We observe the real-time breaking of single Cooper pairs by monitoring the radio-frequency impedance of a superconducting double quantum dot. The Cooper pair breaking rate in the microscale islands of our device decreases as temperature is reduced, saturating at 2 kHz for temperatures beneath 100 mK. In addition, we measure in real time the quasiparticle recombination into Cooper pairs. Analysis of the recombination rates shows that, in contrast to bulk films, a multistage recombination pathway is followed.
Lambert , N J , Edwards , M , Esmail , A A , Pollock , F A , Barrett , S D , Lovett , B W & Ferguson , A J 2014 , ' Experimental observation of the breaking and recombination of single Cooper pairs ' Physical Review. B, Condensed matter and materials physics , vol 90 , no. 14 . DOI: 10.1103/PhysRevB.90.140503
Physical Review. B, Condensed matter and materials physics
© 2014 American Physical Society. Reproduced in accordance with APS transfer of copyright agreement. The final version can also be found via the publisher's website: http://dx.doi.org/10.1103/PhysRevB.90.140503
DescriptionA.J.F. would like to acknowledge the Hitachi Research fellowship, support from Hitachi Cambridge Laboratory, and support from the EPSRC Grant No. EP/H016872/1. B.W.L. is supported by a Royal Society University Research Fellowship. F.A.P. would like to thank the Leverhulme Trust for financial support.
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