Thermal relaxation in titanium nanowires: signatures of inelastic electron-boundary scattering in heat transfer

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 $T_e$ by Joule heating at the base temperature of a dilution refrigerator, we probe the electron-phonon coupling and the thermal boundary resistance at temperatures $T_e=0.5-3$ Kelvin. Using a regular $T^5$-dependent electron-phonon coupling of clean metals and a $T^4$-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.

arXiv comment18 pages, 5 figures

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Cited by in corpus (4)

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• Phonon heat capacity and self-heating normal domains in NbTiN nanostrips
• Heat hunting in freezer: Direct measurement of quasiparticle diffusion in superconducting nanowire
• Universal bottleneck for thermal relaxation in disordered metallic films