Modification of electron-phonon coupling by micromachining and suspension

Saira, Olli-Pentti; Matheny, Matthew H.; Wang, Libin; Pekola, Jukka; Roukes, Michael

doi:10.1063/1.5132948

Title: Modification of electron-phonon coupling by micromachining and suspension

Journal Article · 13 January 2020 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.5132948 · OSTI ID:1593260

^[1];

^[2]; Wang, Libin ^[3]; Pekola, Jukka ^[3]; Roukes, Michael ^[2]

California Inst. of Technology (CalTech), Pasadena, CA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Aalto Univ. (Finland)

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. Here, we attribute the fractional change to a modified phonon spectrum described by recent theoretical developments.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (SC-21)

Grant/Contract Number:: SC0012704

OSTI ID:: 1593260

Report Number(s):: BNL--212427-2019-JAAM

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 2 Vol. 127; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Thermal relaxation in metal films limited by diffuson lattice excitations of amorphous substrates Baeva, E. M.; Titova, N. A.; Veyrat, L. arXiv https://doi.org/10.48550/arxiv.2101.07071	text	January 2021

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