论文标题
同位素对辐射热传输的影响
Isotope effect on radiative thermal transport
论文作者
论文摘要
同位素对热传导和对流的影响已知数十年。但是，是否可以在同位素上进行热辐射仍然是一个悬而未决的问题。在这里，我们预测辐射热流的3级超过3级变化，而在室温下极性介电的同位素组合物有不同的同位素组合物。我们揭示了这是一种同位素质量效应，它诱导了声子线的移位并扩大，进而影响了声子介导的谐振剂吸收。相反，对于金属和掺杂的半导体，同位素效应在很大程度上取决于自由载体。我们还讨论了温度在表面模式激发方面的作用。
Isotope effects on heat conduction and convection have been known for decades. However, whether thermal radiation can be isotopically engineered remains an open question. Here, we predict over 3-orders-of-magnitude variation of radiative heat flow with varying isotopic compositions for polar dielectrics at room temperature. We reveal this as an isotope mass effect which induce phonon line shift and broadening that in turn affect phonon-mediated resonant absorption both in the near and far field. In contrast, the isotope effect is negligible for metals and doped semiconductors which largely depend on free carriers. We also discuss the role of temperature with regard to surface mode excitation.
