用非平衡Landauer方法计算边界热传导和辐射极限的急剧增加
Dramatic increase in the thermal boundary conductance and radiation limit from a Nonequilibrium Landauer Approach
摘要：
边界热导率（TBC）在许多热能和能源应用中至关重要。几十年来的一个难题是，许多测量的热障涂层，例如那些在Al/Si和ZnO/GAN界面上得到很好表征的热障涂层，大大超过了理论结果，甚至超过了被称为“辐射极限”的绝对上限，这表明理论是失败的。在这里，我们确定，对于高传输接口，通常假设的声子本地热平衡邻近的接口失败，和可测量的声子温度不是他们的发射温度。因此，我们发展了一个“非平衡Landauer方法”，并定义了独特的“修饰”和“内在”的热障涂层。结合我们的方法，甚至与一个简单的扩散失配模型（DMM）几乎翻了一倍的理论热障涂层在Al/Si和ZnO/GAN界面，理论结果与实验第一次。辐射极限也被重新定义，发现比原来的辐射极限增加了100%以上，并且可以很好地约束所有实验数据。
英文摘要：
Thermal boundary conductance (TBC) is critical in many thermal and energy applications. 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 limit called the ``radiation limit", suggesting the failure of the theory. Here, we identify that for high-transmission interfaces, the commonly assumed phonon local thermal equilibrium adjacent to the interface fails, and the measurable phonon 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 mismatch model (DMM) nearly doubles the theoretical TBCs across the Al/Si and ZnO/GaN interfaces, and the theoretical results agree with experiments for the first time. The radiation limit is also redefined and found to increase over 100\% over the original radiation limit, and it can now well bound all the experimental data.
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