Substrate-dependent quasiparticle recombination time in superconducting resonators

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2011
Major/Subject
Mcode
Degree programme
Language
en
Pages
062509/1-3
Series
Applied Physics Letters, Volume 99, Issue 6
Abstract
We demonstrate an increased quasiparticle recombination time in superconductingresonators on a SiN x membrane, compared to identical resonators on a SiN x /Si wafer. An interpretation is given using a thermal model of the membrane. Using an array of tunnel junctions to cool or heat the membrane, we show that the resonators on the membranes are extremely sensitive to small changes of the phonon temperature, which renders them excellent phonon thermometers with a noise level equivalent to 5μK/√Hz. The experimental set-up is in principle an ideal platform to study the interplay of quasiparticles and phonon populations in superconductors.
Description
Keywords
phonons, collective excitations, laser resonators, relaxation times, superconductivity
Other note
Citation
Vercruyssen, N. & Barends, R. & Klapwijk, T. M. & Muhonen, J. T. & Meschke, M. & Pekola, Jukka. 2011. Substrate-dependent quasiparticle recombination time in superconducting resonators. Applied Physics Letters. Volume 99, Issue 6. P. 062509/1-3. ISSN 0003-6951 (printed). DOI: 10.1063/1.3624463.