论文标题
用于固体低T玻璃状热性能的新范式
A new paradigm for the low-T glassy-like thermal properties of solids
论文作者
论文摘要
已知眼镜和无序材料在状态，特定的热量和热运输中显示出异常的特征。然而，近年来，这些属性是否真的是异常的（并且是无序系统的特殊），还是比以前想象的更普遍。新的实验和理论观察已经质疑玻色子峰的起源，而在t特异性热中仅来自疾病和TLS的线性。确实在有序或微不足道的化合物以及不适用标准解释的不相称的结构中观察到了相同的特性。使用Phason模式之间的形式类比（例如，在准晶体和不相称的晶格中）和扩散子，以及振幅模式和光学声子之间的形式类比，我们建议在这些属性背后存在更普遍的物理学。特别是，我们加强了t特定热量线性与低能扩散模式相关的想法，并且可以简单地通过间隙光学样式诱导BP过量。
Glasses and disordered materials are known to display anomalous features in the density of states, in the specific heat and in thermal transport. Nevertheless, in recent years, the question whether these properties are really anomalous (and peculiar of disordered systems) or rather more universal than previously thought, has emerged. New experimental and theoretical observations have questioned the origin of the boson peak and the linear in T specific heat exclusively from disorder and TLS. The same properties have been indeed observed in ordered or minimally disordered compounds and in incommensurate structures for which the standard explanations are not applicable. Using the formal analogy between phason modes (e.g. in quasicrystals and incommensurate lattices) and diffusons, and between amplitude modes and optical phonons, we suggest the existence of a more universal physics behind these properties. In particular, we strengthen the idea that linear in T specific heat is linked to low energy diffusive modes and that a BP excess can be simply induced by gapped optical-like modes.
