Science Advances

Supplementary Materials

This PDF file includes:

  • Supplementary Text
  • Table S1. Data of the switching ratios of the thermal switches in Fig. 2C.
  • Table S2. Data of the switching ratios of multiple samples.
  • Table S3. Thermal conductivity, volumetric heat capacity, phonon group velocity, and phonon life time.
  • Fig. S1. Determination of Gon and Goff.
  • Fig. S2. Thermal conductance measurement of a PE microfiber in two heating/cooling cycles.
  • Fig. S3. Heat flow versus temperature bias at different heating rates.
  • Fig. S4. Multiple temperature sweeps of a PE nanofiber.
  • Fig. S5. The vibrational power spectra at three wave vectors before and after the phase transition of crystalline PE nanofibers.
  • Fig. S6. Thermal conductivity of PE from 300 to 500 K.
  • Fig. S7. Spectral energy density of PE at different k-points.
  • Fig. S8. Phonon dispersion and group velocity of PE.
  • Fig. S9. Volume as a function of temperature when fibers are under stretching stress.
  • Fig. S10. Thermal contact resistance between the PE nanofiber and one suspended island as a function of the axial thermal conductivity of the PE nanofiber.
  • Fig. S11. The height map of a suspended nanofiber measured using atomic force microscopy.
  • Fig. S12. Raman spectra in the temperature range from 300 to 420 K.

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