Structure et dynamique des états électroniques dans les matériaux quantiques stratifiés

Layered materials possess unique band structures and physical properties that distinguish them from three-dimensional materials, attracting widespread research interest over the past decades. These distinctive features arise from the strong intralayer atomic bonding and relatively weak interlayer interactions. Therefore, tuning the atom types, intralayer structures, the interlayer interactions, or even stacking different types of materials can fundamentally change the macroscopic physical properties of the system. This thesis focuses on the electronic structure properties of two representative classes of layered materials: transition metal dichalcogenides (TMDs) and two-dimensional perovskites. Using angle-resolved photoemission spectroscopy (ARPES) and its time-resolved extension (tr-ARPES), in combination with electron diffraction, Raman spectroscopy, and transient reflectivity measurements, we systematically investigate complex electronic many body effects, chiral superlattice switching, and electron phonon coupling phenomena in these materials.