Modification of electron-phonon coupling by micromachining and suspension
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2020-01-14
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en
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9
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Journal of Applied Physics, Volume 127, issue 2
Abstract
Weak electron-phonon interaction in metals at low temperatures forms the basis of operation for cryogenic hot-electron bolometers and calorimeters. Here, we develop a thermometry scheme based on proximity supercurrent to study the thermal response of a thin gold film on a SiO 2 platform at temperatures below 100 mK. We find that the exponent of the power law describing electron-phonon coupling in the film drops by approximately 1 / 2 as the platform is micromachined and released from its substrate. This contrasts the conventional theory for bulklike geometries that predicts integer-valued exponents. We attribute the fractional change to a modified phonon spectrum described by recent theoretical developments.Description
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Saira, O P, Matheny, M H, Wang, L, Pekola, J & Roukes, M 2020, ' Modification of electron-phonon coupling by micromachining and suspension ', Journal of Applied Physics, vol. 127, no. 2, 024307 . https://doi.org/10.1063/1.5132948