Surface roughness and thermal conductivity of semiconductor nanowires: Going below the Casimir limit

@inproceedings{Carrete2011SurfaceRA,
  title={Surface roughness and thermal conductivity of semiconductor nanowires: Going below the Casimir limit},
  author={Jes'us Carrete and Luis Javier Gallego and Luis M Varela and Natalio Mingo},
  year={2011}
}
By explicitly considering surface roughness at the atomic level, we quantitatively show that the thermal conductivity of Si nanowires can be lower than Casimir's classical limit. However, this violation only occurs for deep surface degradation. For shallow surface roughness, the Casimir formula is shown to yield a good approximation to the phonon mean free paths and conductivity, even for nanowire diameters as thin as 2.22 nm. Our exact treatment of roughness scattering is in stark contrast… CONTINUE READING

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