Crossover between Electron-Phonon and Boundary-Resistance Limits to Thermal Relaxation in Copper Films

L. B. Wang*, O-P Saira, D. S. Golubev, J. P. Pekola

*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

11 Citations (Scopus)
295 Downloads (Pure)

Abstract

We observe a crossover fromelectron-phonon (e-ph) coupling limited energy relaxation to that governed by thermal boundary resistance (phonon-phonon coupling, ph-ph) in copper films at subkelvin temperatures. Our measurement yields a quantitative picture of heat currents, in terms of temperature dependences and magnitudes, in both e-ph and pp limited regimes, respectively. We show that by adding a third layer in between the copper film and the substrate, the thermal boundary resistance is increased fourfold, consistent with an assumed series connection of thermal resistances.

Original languageEnglish
Article number024051
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Applied
Volume12
Issue number2
DOIs
Publication statusPublished - 23 Aug 2019
MoE publication typeA1 Journal article-refereed

Funding

We acknowledge the provision of the fabrication facilities by Otaniemi research infrastructure for micro and nanotechnologies (OtaNano). This work was performed as part of the Academy of Finland Centre of Excellence program (Project No. 312057) and the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Grant No. 2742559 SQH).

Keywords

  • HEAT-CONDUCTION
  • HOT-ELECTRONS
  • QUANTUM
  • MULTILAYERS

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    • QTF: Finnish Centre of Excellence in Quantum Technology

      Pekola, J. (Principal investigator), Golubev, D. (Project Member), Blanchet, F. (Project Member), Maillet, O. (Project Member), Mannila, E. (Project Member) & Marín Suárez, M. (Project Member)

      01/01/2018 → 31/12/2020

      Project: Academy of Finland: Other research funding

    • SQH: Superconducting quantum heat engines and refrigerators

      Pekola, J. (Principal investigator), Subero Rengel, D. (Project Member), Chiang, K.-H. (Project Member), Gubaydullin, A. (Project Member), Chang, Y.-C. (Project Member), Singh, S. (Project Member), Thomas, G. (Project Member), Upadhyay, R. (Project Member), von Scarpatetti, C. (Project Member), Serrati, E. (Project Member), Blanchet, F. (Project Member), Praks, E. (Project Member), Peltonen, J. (Project Member), Strelnikov, A. (Project Member), Chen, Z.-Y. (Project Member), Senior, J. (Project Member), Mannila, E. (Project Member), Lvov, D. (Project Member), Marín Suárez, M. (Project Member), Satrya, C. (Project Member), Lemziakov, S. (Project Member), Mäkinen, I. (Project Member), Dumas, H. (Project Member), Wang, L. (Project Member) & Karimi, B. (Project Member)

      27/09/2017 → 30/09/2023

      Project: EU: ERC grants

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