论文标题
狭窄的光学声子的寿命和无序纳米颗粒中拉曼峰的形状：I。分析处理
Lifetimes of Confined Optical Phonons and the Shape of a Raman Peak in Disordered Nanoparticles: I. Analytical Treatment
论文作者
论文摘要
通过开发障碍诱导的光振动特征码的拓宽理论来实现非极性晶体纳米圆圆的拉曼光谱的显微镜描述。对此问题进行了分析处理，并确定线形和宽度为声子量子数，纳米颗粒形状，大小和无序强度的功能。发现结果很大程度上取决于宽线分离，或者与其他频谱的其他线重叠。详细研究了三种疾病模型，即弱点样杂质，弱的平滑随机潜力和强大的罕见杂质。还研究了形成声子Imberity绑定状态的可能性。
Microscopic description of Raman spectra in nanopowders of nonpolar crystals is accomplished by developing the theory of disorder-induced broadening of optical vibrational eigenmodes. Analytical treatment of this problem is performed, and line shape and width are determined as functions of phonon quantum numbers, nanoparticle shape, size, and the strength of disorder. The results are found to be strongly dependent on either the broadened line is separated or it is overlapped with other lines of the spectrum. Three models of disorder, i.e. weak point-like impurities, weak smooth random potential and strong rare impurities are investigated in details. The possibility to form the phonon-impurity bound state is also studied.
