Fano-Type Wavelength-Dependent Asymmetric Raman Line Shapes from MoS<sub>2</sub> Nanoflakes
Manushree Tanwar, Love Bansal, Chanchal Rani, Sonam Rani, Suchita Kandpal, Tanushree Ghosh, Devesh K. Pathak, I. Sameera, Ravi Bhatia, Rajesh Kumar
Abstract
. It is proposed that an asymmetrically broadened Raman line shape obtained by 633 nm laser excitation is due to electron-phonon interaction whose electronic continuum is provided by the well-known A and B excitons. Typical wavelength-dependent Raman line shape has been observed, which validates and quantifies the Fano interaction present in the samples. The experimentally obtained Raman scattering data show very good agreement with the theoretical Fano-Raman line-shape functions and help in estimating the coupling strength. Values of the electron-phonon interaction parameter obtained, through line-shape fitting, for the two excitation wavelengths have been compared and shown to have generic Fano-type dependence on the excitation wavelength.