In , Raman spectroscopy is used to study "phonon softening, surface temperature, Fano resonance, and phase change in MoS2 nanoflakes". "The phonon softening and asymmetry in the vibrational modes are attributed to the laser-induced heating and Fano resonance, respectively. Fano resonance happens due to electron-phonon coupling and appears as an asymmetry in the Raman line shape." . The Fano line shape is used for fitting.