Pillar-based phononic crystals on uncut SiN membranes achieve up to an order of magnitude reduction in thermal conductance at sub-Kelvin temperatures via coherent phonon control, with theory-experiment agreement only for lattice constants below 1 μm due to surface roughness scattering.
F.Wave motion in elastic solids(Oxford Uni- versity Press, London, UK, 1975/1991)
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Coherent control of thermal transport with pillar-based phononic crystals
Pillar-based phononic crystals on uncut SiN membranes achieve up to an order of magnitude reduction in thermal conductance at sub-Kelvin temperatures via coherent phonon control, with theory-experiment agreement only for lattice constants below 1 μm due to surface roughness scattering.