Time-Correlated Single-Photon Counting Raman Spectroscopy: A Tool for Investigating Non-Equilibrium Many-Body Interactions

Speaker: Dr. Omer Yeffe

Abstract
Time-resolved Raman spectroscopy is a powerful tool for probing non-equilibrium dynamics in solids. However, conventional pump-probe approaches typically prioritize ultrafast temporal resolution at the cost of spectral resolution, limiting data interpretation. I will present our recent advancements in time-resolved Raman scattering using a time-correlated single-photon counting (TCSPC) setup, revealing distinct relaxation pathways and energy transfer mechanisms in silicon that evolve on nanosecond timescales and remain inaccessible to sub-picosecond pump-probe techniques. Compared to femtosecond Raman methods, TCSPC-based spectroscopy provides high spectral resolution, enabling access to low-frequency THz excitations while maintaining experimental flexibility. Additionally, I will discuss the efficacy of coupled mode models in capturing electron-phonon interactions, offering new insights into many-body dynamics.