标题： 光谱热流在界面传输中的重新分布 显示英文标题

标题： Spectral heat flux redistribution upon interfacial transmission

摘要： 在非金属晶体中，热量通过不同频率的声子传输，每个声子对整体热通量谱的贡献不同。 在本研究中，我们展示了当声子穿过不同固体之间的界面时，热通量在声子频率之间的显著再分配。 这种再分配是由于声子热自然倾向于通过其传播的材料重新建立平衡分布特性。 值得注意的是，尽管不同固体的热通量谱在其体相形式下通常是不同的，但在层厚小于声子平均自由程的超晶格或夹层结构中，它们可以变得几乎相同。 这一现象表明，在界面处，声子频率之间的热再分配到平衡分布并不会立即发生，而是在一定时间和距离上逐渐发展的。 显示英文摘要

摘要： In nonmetallic crystals, heat is transported by phonons of different frequencies, each contributing differently to the overall heat flux spectrum. In this study, we demonstrate a significant redistribution of heat flux among phonon frequencies when phonons transmit across the interface between dissimilar solids. This redistribution arises from the natural tendency of phononic heat to re-establish the equilibrium distribution characteristic of the material through which it propagates. Remarkably, while the heat flux spectra of dissimilar solids are typically distinct in their bulk forms, they can become nearly identical in superlattices or sandwich structures where the layer thicknesses are smaller than the phonon mean free paths. This phenomenon reflects that the redistribution of heat among phonon frequencies to the equilibrium distribution does not occur instantaneously at the interface, rather it develops over some time and distance.