The perfect thermal conductor and the perfect thermal insulator

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Gas kinetic equation is a good place to start• Anharmonicity (high Tlimit)τ− 1∝ ω2 T• Point defect scatteringτ− 1 4∝ω• Boundary scatteringτ − 1∝1/dCahill <strong>and</strong> Pohl, Ann. Rev. Phys. Chem. 39, 93 (1988)
Peak occurs at T ∼ Θ Debye /30 in typical crystals• Anharmonicitycontrols conductivitynear roomtemperature.– k is not a <strong>perfect</strong>quantum number• Not possible (?) toeliminateanharmonicities evenin a computer model.
Page 1 and 2: Thermal unobtainiums?The perfect th
Page 3: Outline—toward perfect thermal in
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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