Our research focuses on the optical and electronic properties of low-dimensional quantum materials — including two-dimensional crystals, topological insulators, and van der Waals heterostructures — with particular emphasis on size-dependent behavior, optical control, and the emergence of novel quantum phenomena. Using femtosecond pump–probe spectroscopy, we investigate carrier relaxation and transport dynamics — including electron-phonon and phonon-phonon interactions — across a broad spectral range spanning the ultraviolet to the terahertz. Beyond free carriers, we explore the ultrafast dynamics of a rich variety of quasi-particles, including excitons, polarons, and polaritons, which play a pivotal role in governing the optical response and energy flow in low-dimensional and strongly coupled light–matter systems. We further investigate artificially engineered nanostructures designed to enhance light–matter interactions and enable precise control over the polarization, phase, and amplitude of THz radiation, as well as polaritonic systems as a platform for confining and manipulating infrared light at sub-diffractional scales. Complementing our ultrafast capabilities, we are equipped to perform magneto-optical measurements under extreme conditions — up to 7 T magnetic fields at temperatures as low as 1.4 K — enabling the exploration of exotic quantum phases, Landau level physics, and magnetically driven phenomena in topologically nontrivial and strongly correlated materials.