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Thermal boundary conductance (TBC) is critical in many thermal and energyapplications. A decades-old puzzle has been that many of the measured TBCs,such as those well characterized across Al/Si and ZnO/GaN interfaces,significantly exceed theoretical results or even the absolute upper limitcalled the ``radiation limit", suggesting the failure of the theory. Here, weidentify that for high-transmission interfaces, the commonly assumed phononlocal thermal equilibrium adjacent to the interface fails, and the measurablephonon temperatures are not their emission temperature. We hence develop a``nonequilibrium Landauer approach" and define the unique ``dressed" and``intrinsic" TBCs. Combining our approach even with a simple diffuse mismatchmodel (DMM) nearly doubles the theoretical TBCs across the Al/Si and ZnO/GaNinterfaces, and the theoretical results agree with experiments for the firsttime. The radiation limit is also redefined and found to increase over 100\%over the original radiation limit, and it can now well bound all theexperimental data.

Dramatic increase in the thermal boundary conductance and radiation limit from a Nonequilibrium Landauer Approach