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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Phonon transport in nanostructures is crucial for thermal management.
  • Controlling heat flow at the nanoscale requires understanding scattering mechanisms.
  • Line-of-sight (LOS) influences thermal conductivity in confined geometries.

Purpose of the Study:

  • To investigate the impact of tortuous thermal paths on silicon nanobeam thermal conductivity.
  • To quantify the effect of blocked line-of-sight (LOS) on phonon propagation.
  • To validate a predictive model for thermal transport in nanostructures with controlled LOS.

Main Methods:

  • Fabrication of single-crystalline silicon nanobeams with varying slit widths to create labyrinths.
  • Measurement of thermal conductivity using a microfabricated device.
  • Modeling phonon transport using the Boltzmann transport equation combined with ab initio calculations.

Main Results:

  • Thermal conductivity decreased monotonically with increasing slit width, reducing LOS.
  • Measured thermal conductivity dropped from ~47 W/m·K (straight beam) to ~31 W/m·K (395 nm slit).
  • The model accurately predicted experimental data (within ~8%) and showed a ~14% reduction for the most tortuous path.

Conclusions:

  • Line-of-sight (LOS) is a critical parameter for characterizing and interpreting phonon propagation in nanostructures.
  • Introducing tortuous paths via slits effectively modulates thermal conductivity.
  • The combined Boltzmann transport equation and ab initio model provides reliable predictions for thermal transport in nanostructures.