The paper predicts thermal rectification ratios between 0.75 and 6 for graded diamond film stacks by truncating the phonon spectrum at the thin-film dimension, assuming the filtered phonon population does not re-thermalize.
Dames, Solid-state thermal rectification with existing bulk materials, Journal of Heat Trans- fer 131, 061301 (2009)
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A Theoretical Paradigm for Thermal Rectification via Phonon Filtering and Energy Carrier Confinement
The paper predicts thermal rectification ratios between 0.75 and 6 for graded diamond film stacks by truncating the phonon spectrum at the thin-film dimension, assuming the filtered phonon population does not re-thermalize.