Low-temperature thermal conductances of amorphous dielectric microbridges in the diffusive to ballistic transition

Details Low-temperature thermal conductances of amorphous dielectric microbridges in the diffusive to ballistic transition Low-temperature thermal conductances of amorphous dielectric microbridges in the diffusive to ballistic transition

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvb..83s5418w&link_type=abstract

Physical Review B, vol. 83, Issue 19, id. 195418

Physics

Glasses And Polymers, Bolometers, Infrared, Submillimeter Wave, Microwave, And Radiowave Receivers And Detectors, Photoconductors And Bolometers, Superconducting Infrared, Submillimeter And Millimeter Wave Detectors

Scientific paper

Through a lossy acoustic-wave model we explore the effect of inelastic scattering on the low-temperature thermal conductances of amorphous dielectric microbridges in the diffusive to ballistic transition. The model gives not only the thermal flux as a function of geometry and temperature, but also the temperature distribution of the internal degrees of freedom that constitute the loss, which in turn can be used for calculating noise. The approach leads to powerful conceptual insights and provides a numerical framework for analyzing experimental data. SixNy tends to behave ballistically at low frequencies and diffusively at high frequencies, and when integrated over all frequency, the diffusive to ballistic transition becomes apparent at lengths of around a few hundred microns. It is possible to include flux-dependent acoustic loss, which leads to counterintuitive thermal behavior. A sample can behave diffusively when measured using a small temperature difference, but ballistically when measured using a large temperature difference. There is compelling circumstantial evidence that the effects of acoustic saturation have been seen, but not explicitly recognized, on many occasions.

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