The perfect thermal conductor and the perfect thermal insulator

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Time domain thermoreflectance since 2003• Improved optical design• Normalization by out-ofphasesignal eliminatesartifacts, increases dynamicrange and improvessensitivity• Exact analytical model forGaussian beams andarbitrary layered geometries• One-laser/two-colorapproach tolerates diffusescattering, see Kang et al.,RSI (2008)Clone built at Fraunhofer Institute forPhysical Measurement, Jan. 7-8 2008
Layered disordered crystals: WSe 2 by“modulated elemental reactants”• Deposit W and Selayers at roomtemperature on Sisubstrates• Anneal to removeexcess Se andimprove crystallinity• Characterize by RBS,x-ray diffraction (labsources and AdvancedPhoton Source) andTEMD. Johnson and co-workers
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 and 20: Disorder creates localization in 1D
Page 21: Works well for homogeneousdisordere
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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