Thermal Relaxation in Titanium Nanowires: Signatures of Inelastic Electron-Boundary Scattering in Heat Transfer

Teemu Elo, Pasi Lähteenmäki, Dmitri Golubev, Alexander Savin, Konstantin Arutyunov, Pertti Hakonen*

*Corresponding author for this work

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

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Abstract

We have employed noise thermometry for investigations of thermal relaxation between the electrons and the substrate in nanowires patterned from 40-nm-thick titanium film on top of silicon wafers covered by a native oxide. By controlling the electronic temperature (Formula presented.) by Joule heating at the base temperature of a dilution refrigerator, we probe the electron–phonon coupling and the thermal boundary resistance at temperatures (Formula presented.)–3 K. Using a regular (Formula presented.)-dependent electron–phonon coupling of clean metals and a (Formula presented.)-dependent interfacial heat flow, we deduce a small contribution for the direct energy transfer from the titanium electrons to the substrate phonons due to inelastic electron-boundary scattering.

Original languageEnglish
Pages (from-to)204–216
Number of pages13
JournalJournal of Low Temperature Physics
Volume189
Issue number3-4
DOIs
Publication statusPublished - 16 Aug 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Electron-phonon coupling
  • Electronic Kapitza conductance
  • Kapitza resistance
  • Shot noise thermometry
  • Thermal contact
  • Thermal relaxation
  • Titanium

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    • QuDeT: Quantum devices in topological matter: carbon nanotubes, graphene, and novel superfluids

      Hakonen, P. (Principal investigator), Todoshchenko, I. (Project Member), Häkkinen, P. (Project Member), Will, M. (Project Member), Kumar, M. (Project Member), Hüttel, A. (Project Member), Tong, F. (Project Member), Song, X. (Project Member), Nagaev, A. (Project Member), Ervasti, M. (Project Member), Manninen, J. (Project Member), Thanniyil Sebastian, A. (Project Member), Korhonen, K. (Project Member), Zavyalov, V. (Project Member), Kamada, M. (Project Member), Tan, Z. (Project Member), Perelshtein, M. (Project Member), Haque, M. (Project Member), Kaikkonen, J.-P. (Project Member), Kirsanov, N. (Project Member), Sergeicheva, E. (Project Member), Pandey, P. (Project Member) & Lilja, I. (Project Member)

      05/11/2015 → 31/12/2021

      Project: EU: ERC grants

    • Centre of Excellence in Low Temperature Quantum Phenomena and Devices

      Hakonen, P. (Principal investigator), Cox, D. (Project Member), Thanniyil Sebastian, A. (Project Member), Kumar, M. (Project Member), Kaikkonen, J.-P. (Project Member), Elo, T. (Project Member), Song, X. (Project Member) & Lähteenmäki, P. (Project Member)

      01/01/2015 → 31/12/2017

      Project: Academy of Finland: Other research funding

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