Role of crystal structure and junction morphology on interface thermal conductance

Carlos A. Polanco, Rouzbeh Rastgarkafshgarkolaei, Jingjie Zhang, Nam Q. Le, Pamela Norris, Patrick Hopkins & Avik Ghosh
We argue that the relative thermal conductance between interfaces with different morphologies is controlled by crystal structure through Mmin/Mc > 1, the ratio between the minimum mode count on either side Mmin, and the conserving modes Mc that preserve phonon momentum transverse to the interface. Junctions with an added homogenous layer, “uniform,” and “abrupt” junctions are limited to Mc, while junctions with interfacial disorder, “mixed,” exploit the expansion of mode spectrum to Mmin. In our...
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