Event Details

The near band-edge optical response of an emerging class of semiconductors, known as the transitional metal dichalcogenides (TMDs), is dominated by tightly-bound excitons and charged excitons (i.e. trions). A fundamental property of these quasiparticles (excitons and trions) is dephasing time, which reflects irreversible quantum dissipation arising from system (excitons and trions) and bath (vacuum and other quasiparticles) interactions and determines the timescale during which excitons and trions can be coherently manipulated. Using a powerful coherent spectroscopy method known as the two-dimensional Fourier transform spectroscopy, we investigate the ultrafast coherent dynamics of excitons, trions, and valley pseudo-spins in these monolayer semiconductors.