论文标题
高阶间潜能对弹性声子散射的影响
Effects of high order interatomic potential on elastic phonon scatterings
论文作者
论文摘要
二次阶以上的原子间电位为晶格中的声子传输提供了散射源。通过使用弱相互互动的界面模型，我们研究了原子间电位与多声子散射过程之间的关系。我们发现，高阶间潜能不仅会导致多声子散射过程，而且对弹性声子散射过程产生了重大影响。以第四阶电位为例，我们表明它可以通过形成局部声子来显着影响弹性声子散射。这种影响与界面原子的相关性密切相关，随着温度的升高，它变得越来越重要。我们的工作表明，仅考虑研究弹性声子传输的二次潜力是不足的。
Interatomic potentials beyond quadratic order provide scattering sources for phonon transport in lattice. By using a weakly-interacting interface model, we investigated the relation between the order of interatomic potential and the multiple-phonon scattering process. We find that high order interatomic potential not only causes multiple-phonon scattering processes, but also has significant impacts on elastic phonon scattering processes. Using fourth order potential as an example, we show that it can significantly affects elastic phonon scatterings, through the formation of localized phonons. Such impact is closely related to the correlations of interfacial atoms and it becomes more significant with increasing temperature. Our work suggests that it is insufficient to consider only quadratic potential to investigate elastic phonon transport.
