The perfect thermal conductor and the perfect thermal insulator

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Thermal resistance is created by Umklappscattering (U-process)• Illustration gives examples of:N-process T+L → LU-process T+T → L• Considerations of symmetry anddimensionality are subtle and complex, seeHerring Phys. Rev. (1954).Peierls, Ann. Phys. 3, 1055 (1929)
Isotopes contribute to thermal resistance• Isotopically pure diamond has highest thermalconductivity of any materialWei et al., PRL 70, 3764 (1993)
Page 1 and 2: Thermal unobtainiums?The perfect th
Page 3 and 4: Outline—toward perfect thermal in
Page 5: Peak occurs at T ∼ Θ Debye /30 i
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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