Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki
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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2020, Volume 111, Issue 2, Pages 88–92
DOI: https://doi.org/10.31857/S0370274X20020071 (Mi jetpl6090) 		 
This article is cited in 5 scientific papers (total in 5 papers)

CONDENSED MATTER

Universal bottleneck for thermal relaxation in disordered metallic films

E. M. Baevaab, N. A. Titovab, A. I. Kardakovabc, S. V. Piatrushaa, V. S. Khrapaiba

a Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
b Moscow State University of Education, Moscow, 119435 Russia
c National Research University Higher School of Economics, Moscow, 101000 Russia
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DOI: https://doi.org/10.31857/S0370274X20020071
Abstract: We study the heat relaxation in current biased metallic films in the regime of strong electron–phonon coupling. A thermal gradient in the direction normal to the film is predicted, with a spatial temperature profile determined by the temperature-dependent heat conduction. In the case of strong phonon scattering, the heat conduction occurs predominantly via the electronic system and the profile is parabolic. This regime leads to the linear dependence of the noise temperature as a function of bias voltage, in spite of the fact that all the dimensions of the film are large compared to the electron–phonon relaxation length. This is in stark contrast to the conventional scenario of relaxation limited by the electron–phonon scattering rate. A preliminary experimental study of a 200-nm-thick NbN film indicates the relevance of our model for materials used in superconducting nanowire single-photon detectors.
Funding agency Grant number
Russian Foundation for Basic Research 19-32-80037
Russian Science Foundation 17-72-30036
19-12-00326
Ministry of Education and Science of the Russian Federation MK-1308.2019.2
Russian Academy of Sciences - Federal Agency for Scientific Organizations
The development of the theoretical model was supported by the Russian Foundation for Basic Research (project no. 19-32-80037). The fabrication of the NbN sample and transport characterization were supported by the Russian Science Foundation (project no. 17-72-30036). Noise measurements were supported by the Russian Science Foundation (project no. 19-12-00326). A.I. Kardakova and E.M. Baeva acknowledge the support of the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1308.2019.2). The data analysis was supported by the Ministry of Science and Higher Education of the Russian Federation (state task for the Institute of Solid State Physics, Russian Academy of Sciences).
Received: 27.11.2019
Revised: 04.12.2019
Accepted: 04.12.2019
English version:
Journal of Experimental and Theoretical Physics Letters, 2020, Volume 111, Issue 2, Pages 104–108
DOI: https://doi.org/10.1134/S0021364020020034
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: E. M. Baeva, N. A. Titova, A. I. Kardakova, S. V. Piatrusha, V. S. Khrapai, “Universal bottleneck for thermal relaxation in disordered metallic films”, Pis'ma v Zh. Èksper. Teoret. Fiz., 111:2 (2020), 88–92; JETP Letters, 111:2 (2020), 104–108
Citation in format AMSBIB
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    • This publication is cited in the following 5 articles:
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    		Письма в Журнал экспериментальной и теоретической физики Pis'ma v Zhurnal Иksperimental'noi i Teoreticheskoi Fiziki
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