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Single quasiparticle excitation dynamics on a superconducting island

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arxiv 1212.2755 v2 pith:S46TN3P6 submitted 2012-12-12 cond-mat.supr-con

Single quasiparticle excitation dynamics on a superconducting island

V. F. Maisi , S. V. Lotkhov , A. Kemppinen , A. Heimes , J. T. Muhonen , J. P. Pekola This is my paper
classification cond-mat.supr-con
keywords islandexcitationquasiparticleratesinglealuminumdynamicselectrons
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We investigate single quasiparticle excitation dynamics on a small superconducting aluminum island connected to normal metallic leads by tunnel junctions. We find the island to be free of excitations within the measurement resolution allowing us to determine Cooper pair breaking rate to be less than 3 kHz. By tuning the Coulomb energy of the island to have an odd number of electrons, one of them remains unpaired. We detect it by measuring its relaxation rate via tunneling. By injecting electrons with a periodic gate voltage, we probe electron-phonon interaction and relaxation down to a single quasiparticle excitation pair, with a measured recombination rate of 8 kHz. Our experiment yields a strong test of BCS-theory in aluminum as the results are consistent with it without free parameters.

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