原子-表面散射中的声子线型
Phonon lineshapes in atom-surface scattering
摘要：
基于Caldeira-Leggett哈密顿量，从一个简单的随机模型中得到了原子-表面散射中的声子线型。在这个单浴模型中，从创建或湮灭事件产生的激发声子耦合到由无限数量的谐振子组成的热浴，即浴声子。相应的哈密顿量的对角化导致声子频率的声子摩擦或阻尼系数的重整化。此外，当表面存在吸附物时，考虑到吸附物对声子线型及其相应线型的影响，该单浴模型可推广为双浴模型。
英文摘要：
Phonon lineshapes in atom-surface scattering are obtained from a simple stochastic model based on the so-called Caldeira-Leggett Hamiltonian. In this single-bath model, the excited phonon resulting from a creation or annihilation event is coupled to a thermal bath consisting of an infinite number of harmonic oscillators, namely the bath phonons. The diagonalization of the corresponding Hamiltonian leads to a renormalization of the phonon frequencies in terms of the phonon friction or damping coefficient. Moreover, when there are adsorbates on the surface, this single-bath model can be extended to a two-bath model accounting for the effect induced by the adsorbates on the phonon lineshapes as well as their corresponding lineshapes.
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