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(a) Film and (b) wire models. The film is infinite in the in-plane directions, and the wire is infinite along its axis.
(Color online) Comparison of thermal conductivity models and experimental data for silicon nanostructures at a temperature of 300 K: (a) film in-plane, (b) film cross-plane, (c) wire.
Group velocities and diffuse boundary scattering lifetimes. Forthe film, the average distance traveled ballistically by a phonon before hitting the top or bottom surface is . For thewire (with D = 2R), the average distance traveled ballistically by a phonon before hitting the side is . θ and φ are the spherical angles.
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