Ultrafast spectroscopic studies are always instructive to understand the physics of light-matter interactions. Within a few pico-seconds after photo-excitation, the excess energy of photo-excited carriers get transferred to the lattice and eventually they attain a state of equilibrium, a process known as ultrafast thermalization. Electron-phonon (e-ph) coupling play a pivotal role in this process. The process of ultrafast thermalization was investigated in an assembly of ZnO nanorods and the analysis from the framework of Two Temperature Model (TTM) yields prolonged thermalization time due to reduced electron-phonon coupling at higher photo-excited carrier density [1].
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