Ultrafast magneto-spectroscopy of van der Waals materials
This project investigates the spin, valley, and pseudospin dynamics in MoSe₂ and WSe₂ multilayers under applied electric and magnetic fields. It builds on our recent discovery of pseudospin quantum beats in these materials, which revealed unexpected non-zero in-plane g-factors.
To further elucidate the physical origin of these quantum beats and their dependence on external fields and layer structure, we perform systematic time-resolved spectroscopic studies. Specifically, we employ time-resolved Faraday ellipticity measurements, transient differential transmission, and time-resolved photoluminescence. These complementary techniques allow us to probe both the coherent dynamics of spins and pseudospins and the relaxation and recombination processes of the involved quasiparticles.
By combining these experimental approaches, we aim to uncover the underlying coupling mechanisms between spin, valley, and pseudospin degrees of freedom and to explore how these properties can be controlled by external electric and magnetic fields. The results will contribute to a deeper understanding of many-body dynamics in two-dimensional semiconductors and may open new perspectives for applications in spintronics and valleytronics.
