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

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

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [2]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  3. Aalto Univ. (Finland)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (SC-21)
OSTI Identifier:
1593260
Report Number(s):
BNL-212427-2019-JAAM
Journal ID: ISSN 0021-8979
Grant/Contract Number:  
SC0012704; W911NF-13-1-0390; W911NF-18-1-0028
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 127; Journal Issue: 2; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; Mesoscale and Nanoscale Physics

Citation Formats

Saira, Olli-Pentti, Matheny, Matthew H., Wang, Libin, Pekola, Jukka, and Roukes, Michael. Modification of electron-phonon coupling by micromachining and suspension. United States: N. p., 2020. Web. doi:10.1063/1.5132948.
Saira, Olli-Pentti, Matheny, Matthew H., Wang, Libin, Pekola, Jukka, & Roukes, Michael. Modification of electron-phonon coupling by micromachining and suspension. United States. doi:10.1063/1.5132948.
Saira, Olli-Pentti, Matheny, Matthew H., Wang, Libin, Pekola, Jukka, and Roukes, Michael. Tue . "Modification of electron-phonon coupling by micromachining and suspension". United States. doi:10.1063/1.5132948.
@article{osti_1593260,
title = {Modification of electron-phonon coupling by micromachining and suspension},
author = {Saira, Olli-Pentti and Matheny, Matthew H. and Wang, Libin and Pekola, Jukka and Roukes, Michael},
abstractNote = {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.},
doi = {10.1063/1.5132948},
journal = {Journal of Applied Physics},
number = 2,
volume = 127,
place = {United States},
year = {2020},
month = {1}
}

Journal Article:
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