Program Results

Introduction to the event

Femtosecond laser spectroscopy has been the cornerstone of our research program, enabling direct access to ultrafast dynamics and many-body interactions in low-dimensional quantum materials. By generating few-cycle pulses with carrier-envelope-phase (CEP) stabilization, we are able to coherently drive and probe electronic, excitonic, and phononic states with temporal resolution below 10 fs and peak powers exceeding 7 GW. These capabilities go beyond conventional optical probes, providing the precision required to resolve non-adiabatic processes and transient correlations at the quantum limit. By femtosecond excitation, we coherently control the quantum interference pathways in semiconducting nanotubes, optically driving Mott insulating states and inducing layer hybridization in 2D moiré systems. These nonequilibrium electron dynamics can only be observed and manipulated by the femtosecond laser spectroscopy, with energy and temporal resolution sensitive to electrons, spin, lattice, photons and their interplays in the strong -coupling regimes.