Excitation of single quasiparticles in a small superconducting Al island connected to normal-metal leads by tunnel junctions

Ville Maisi, S.V. Lotkhov, A. Kemppinen, A. Heimes, J.T. Muhonen, J.P. Pekola

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

41 Sitaatiot (Scopus)
257 Lataukset (Pure)

Abstrakti

We investigate the dynamics of individual quasiparticle excitations 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. This allows us to show that the residual heating, which typically limits experiments on superconductors, has an ultralow value of less than 0.1 aW. 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 16 kHz. Our experiment yields a strong test of BCS theory in aluminum as the results are consistent with it without free parameters.
AlkuperäiskieliEnglanti
Artikkeli147001
Sivut1-5
Sivumäärä5
JulkaisuPhysical Review Letters
Vuosikerta111
Numero14
DOI - pysyväislinkit
TilaJulkaistu - 3 lokak. 2013
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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