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Modification of electron-phonon coupling by micromachining and suspension

Saira, Olli-Pentti and Matheny, Matthew H. and Wang, Libin and Pekola, Jukka and Roukes, Michael (2020) Modification of electron-phonon coupling by micromachining and suspension. Journal of Applied Physics, 127 (2). Art. No. 024307. ISSN 0021-8979. doi:10.1063/1.5132948.

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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 SiO₂ 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Saira, Olli-Pentti0000-0001-9715-0897
Matheny, Matthew H.0000-0002-3488-1083
Wang, Libin0000-0001-5559-4879
Pekola, Jukka0000-0003-0984-1829
Roukes, Michael0000-0002-2916-6026
Additional Information:© 2020 Published under license by AIP Publishing. Submitted: 21 October 2019; Accepted: 18 December 2019; Published Online: 14 January 2020. We thank D.-V. Anghel for important discussions during the preparation of the manuscript. This material is based upon work supported by, or in part by, the U.S. Army Research Laboratory and the U.S. Army Research Office under Contract Nos. W911NF-13-1-0390 and W911NF-18-1-0028, and the Academy of Finland under Contract No. 312057.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Army Research LaboratoryW911NF-13-1-0390
Army Research Office (ARO)W911NF-18-1-0028
Academy of Finland312057
Issue or Number:2
Record Number:CaltechAUTHORS:20191216-162059894
Persistent URL:
Official Citation:Modification of electron-phonon coupling by micromachining and suspension. Olli-Pentti Saira, Matthew H. Matheny, Libin Wang, Jukka Pekola, and Michael Roukes. Journal of Applied Physics 127:2; doi: 10.1063/1.5132948
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100321
Deposited By: Tony Diaz
Deposited On:17 Dec 2019 00:51
Last Modified:16 Nov 2021 17:53

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