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

V.F. Maisi (Corresponding Author), S.V. Lotkhov, Antti Kemppinen, A. Heimes, J.T. Muhonen, J.P. Pekola

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

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.
Original languageEnglish
Article number147001
JournalPhysical Review Letters
Volume111
Issue number14
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

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tunnel junctions
excitation
aluminum
BCS theory
electron phonon interactions
heating
probes
electric potential
electrons

Cite this

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abstract = "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.",
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Excitation of single quasiparticles in a small superconducting Al island connected to normal-metal leads by tunnel junctions. / Maisi, V.F. (Corresponding Author); Lotkhov, S.V.; Kemppinen, Antti; Heimes, A.; Muhonen, J.T.; Pekola, J.P.

In: Physical Review Letters, Vol. 111, No. 14, 147001, 2013.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Excitation of single quasiparticles in a small superconducting Al island connected to normal-metal leads by tunnel junctions

AU - Maisi, V.F.

AU - Lotkhov, S.V.

AU - Kemppinen, Antti

AU - Heimes, A.

AU - Muhonen, J.T.

AU - Pekola, J.P.

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevLett.111.147001

DO - 10.1103/PhysRevLett.111.147001

M3 - Article

VL - 111

JO - Physical Review Letters

JF - Physical Review Letters

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