Phonon-mediated thermal transport at exponentially mass-graded interfaces: A computational study

Rouzbeh Rastgarkafshgarkolaei, Jinjie Zhang, Carlos A. Polanco, Nam Q. Le, Avik Ghosh & Pamela Norris
We numerically investigate thermal transport at solid-solid interfaces with graded intermediate layers whose masses vary exponentially from one side to the other. Using Non-Equilibrium Green's Function and Non-Equilibrium Molecular Dynamics simulations, we show that an exponentially mass-graded junction with a finite thickness can result in 68% of enhancement in thermal conductance larger compared to a single bridging layer (29%) and a linear mass-graded junction (64%) of similar thickness. We examine how the thermal conductance at...
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