Understanding the effect of Anharmonicity and Fano interaction in solids using Raman spectromicroscopy

Abstract

Fano interaction is one of the most important phenomena which requires a focused study to observe the different properties of material. Fano interaction originates due to the mixing of the continuum of electronic state and discrete phonon in heavily doped systems or in complex systems. Due to Fano interaction, a material starts showing new properties which depend strongly on doping concentration and doping type in such a way that it becomes more prominent with slight change in doping or any external perturbation like temperature. Raman spectroscopy, being a sensitive and non-destructive tool, can detect subtle scale phenomena and is thus indulges in the analysis of different systems. Various perturbations such as temperature effect, electron-phonon (Fano) interaction, quantum confinement effect etc., affect the Raman spectra by changing the various parameters of Raman lineshape and these effects are well-explored in various materials, especially in Si.