Radiative ballistic phonon transport in silicon-nitride membranes at low temperatures

  title={Radiative ballistic phonon transport in silicon-nitride membranes at low temperatures},
  author={Henk F. C. Hoevers and M. L. Ridder and Alexander Germeau and Marcel P. Bruijn and P. A. J. Korte and Remco J. Wiegerink},
  journal={Applied Physics Letters},
We studied the phonon transport in free-standing 1 µm thick silicon-nitride membranes at temperatures around 100 mK. By varying the geometry of the membranes and the dimensions of the heater element, we are able to distinguish between radiative and diffuse phonon transport. The data indicate that the transport is radiative ballistic with a lower limit to a phonon mean-free path of about 1 mm and that the probability for specular reflection from the surface is at least 0.99. The tested silicon… 

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