Prediction of Spectral Phonon Mean Free Path and Thermal Conductivity with Applications to Thermoelectrics and Thermal Management: A Review

Figure 8

Scattering rate (color online) of TA mode at 300 K due to (a) absorption of an acoustic phonon to yield another acoustic phonon, (b) absorption of an acoustic phonon to yield an optical phonon, (c) absorption of an optical phonon to yield another optical phonon, and (d) total scattering rate, along (𝜉,𝜉,𝜉) in ²⁸Si, “average material,” and SiGe[001]₁₊₁ superlattice. 𝜉 is reduced wave vector, with 𝐤=(𝜉,𝜉,𝜉)⋅2𝜋/𝑎. Reprinted with permission from [108]. Copyright (2011) American Chemical Society.