The perfect thermal conductor and the perfect thermal insulator

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Outline—toward perfect thermal conductors• Conventional conduction of heat in solids byphonons and electrons– phonon scattering mechanisms in dielectriccrystals– metals• Examples of unconventional heat conduction– Poiseuille flow of heat– ambipolar heat conduction• Heat conduction in Bose condensates– electronic superconductors– superfluid helium– Bose condensate of magnons
Outline—toward perfect thermal insulators• Einstein and minimum thermal conductivity• Localization of lattice vibrations by disorder• Beating the minimum with anisotropicdisordered materials: disordered layeredcrystalsConclude with some thoughts on promising,high-risk, research directions
Page 1: Thermal unobtainiums?The perfect th
Page 5 and 6: Peak occurs at T ∼ Θ Debye /30 i
Page 7 and 8: Isotopes contribute to thermal resi
Page 9 and 10: High Debye temperature also produce
Page 11 and 12: Ambipolar diffusion contributes to
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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