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

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.

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| openaire: EC/H2020/670743/EU//QuDeT

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

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10.1007/s10909-017-1802-2

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Elo, T, Lähteenmäki, P, Golubev, D, Savin, A, Arutyunov, K & Hakonen, P 2017, ' Thermal Relaxation in Titanium Nanowires : Signatures of Inelastic Electron-Boundary Scattering in Heat Transfer ', Journal of Low Temperature Physics, vol. 189, no. 3-4, pp. 204–216 . https://doi.org/10.1007/s10909-017-1802-2

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https://urn.fi/URN:NBN:fi:aalto-201808014197

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[article-cris] Perustieteiden korkeakoulu / SCI

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

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