The perfect thermal conductor and the perfect thermal insulator

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Unconventional heat conduction: Poiseuilleflow of phonons• Counter-intuitive:strong N-processesscreen the interactingphonon gas from theboundaries of thecrystal.• RequireslUlNrrLimited to He crystals(?)Hogan, Guyer, and Fairbank, PR 185, 356 (1969)
Ambipolar diffusion contributes to heatconduction.• In an intrinsicsemiconductor, e-h pairsdiffuse from hot-to-cold,driven by theconcentration gradient.• Each pair carriers theband-bap energy (but nocharge).Glassbrenner and Slack, PR 134, A1058 (1964)
Page 1 and 2: Thermal unobtainiums?The perfect th
Page 3 and 4: Outline—toward perfect thermal in
Page 5 and 6: Peak occurs at T ∼ Θ Debye /30 i
Page 7 and 8: Isotopes contribute to thermal resi
Page 9: High Debye temperature also produce
Page 13 and 14: But unconventional metals show avar
Page 15 and 16: Could a solid-state Bose condensate
Page 17 and 18: Nanoscale boundary scattering reduc
Page 19 and 20: Disorder creates localization in 1D
Page 21 and 22: Works well for homogeneousdisordere
Page 23 and 24: Layered disordered crystals: WSe 2
Page 25 and 26: Thermal conductivity of WSe 2• 60
Page 27 and 28: Back to experiment: Can we lower th
Page 29 and 30: Research directions• Passive and

The perfect thermal conductor and the perfect thermal insulator

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