The perfect thermal conductor and the perfect thermal insulator

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Einstein (1911)• coupled the Einsteinoscillators to 26neighbors• heat transport as arandom walk ofthermal energybetween atoms; timescale of ½ vibrationalperiod• did not realize waves(phonons) are thenormal modes of acrystal
Works well for homogeneousdisordered materialsamorphousdisordered crystalCahill, Watson, and Pohl, PRB (1991)
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 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: Disorder creates localization in 1D
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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