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. 2018 Feb 9;8:2737. doi: 10.1038/s41598-018-20997-8

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© The Author(s) 2018

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(a) Intrinsic thermal conductivity and (b) effective phonon mean free path as a function of superlattice period. Both quantities reach a minimum value at $ℓ_{p} = 3.43$ nm, which marks the interface between coherent and incoherent phonon transport. The dashed lines are just a guide to the eye.