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. https://resolver.caltech.edu/CaltechAUTHORS:20191216-162059894

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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 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:

URL	URL Type	Description
https://doi.org/10.1063/1.5132948	DOI	Article
https://arxiv.org/abs/1910.10126	arXiv	Discussion Paper

ORCID:

Author	ORCID
Saira, Olli-Pentti	0000-0001-9715-0897
Matheny, Matthew H.	0000-0002-3488-1083
Wang, Libin	0000-0001-5559-4879
Pekola, Jukka	0000-0003-0984-1829
Roukes, Michael	0000-0002-2916-6026

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

Funders:

Funding Agency	Grant Number
Army Research Laboratory	W911NF-13-1-0390
Army Research Office (ARO)	W911NF-18-1-0028
Academy of Finland	312057

Issue or Number:

DOI:

10.1063/1.5132948

Record Number:

CaltechAUTHORS:20191216-162059894

Persistent URL:

https://resolver.caltech.edu/CaltechAUTHORS:20191216-162059894

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

Collection:

CaltechAUTHORS

Deposited By:

Tony Diaz

Deposited On:

17 Dec 2019 00:51

Last Modified:

16 Nov 2021 17:53

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