Our laboratory, LPMS, has a long-standing experience with characterization of the electronic structure of solids by photo-based spectroscopies, namely by ARPES and SARPES. In the next period we will continue with this technique and will improve our approach to time-resolved studies in our collaboration with ATTOLab. In recent years we worked on transition-metal oxides and Bi thin films searching for topologic properties, as Bi is a parent compound of topological insulators. We consider that our future work should be a logical development of skills acquired in the past. 2-dimensionnal (2D) systems are vast playgrounds with many different materials that call to be explored. Enlarging the experimental approach by time-and spin- resolved studies in photoemission will considerably strengthen the projects and will place them as an emerging activity. We would like to fully orient our research activity to 2D aspects of: a) Transition-Metal Di-Chalogenides (TMDC) materials b) transition metal oxides, surface and bulk properties a) Transition-Metal Di-Chalogenides State of the art Spin–orbit coupling (SOC) describes the relativistic interaction between the spin and momentum degrees of freedom of electrons and is central to a rich range of phenomena observed in condensed matter systems. In recent years, new phases of matter have emerged from the interplay between SOC and low dimensionality. Transition metal dichalcogenides (TMDCs) are an emerging class of materials with properties that are highly attractive for fundamental studies of novel physical phenomena and for applications, see e.g. [W. Choi et al., Mat.Today 2017]. An important aspect for future applications is the degree of tunability of both the electronic structure and the electron dynamics for 2D semiconductors embedded in a van der Waals-bonded heterostructure formed by TMDCs. The electronic structure of 2D semiconductors can be significantly altered by screening effects, either from free charge carriers in the material or by environmental screening from the surrounding medium. The physical properties of 2D semiconductors placed in a heterostructure with other 2D materials are therefore governed by a complex interplay of both intra- and interlayer interactions. Spin dynamics can be observed by optical methods, such as time-resolved Kerr reflectometry, bringing a global information on electron and spin population. However direct spectroscopic spin- and time-resolved studies, leading to much more detailed understanding of material properties which can be accomplished by the photoemission technique are still missing. There is indeed a conspicuous gap in our knowledge of this class of materials, especially given that their most important applications derive from the possibility of selectivity triggering spin dynamics in parts of the Brillouin zone. A direct observation of band- and momentum-resolved spin dynamics is indispensable to any technological advancement in the field. With the present project we specifically aim at closing this critical gap in the knowledge. International collaborators involved 1) Data will be interpreted theoretically using a state of the art approach able to describe with unprecedented accuracy the thermalization of laser-excited electrons and their transport strongly-out-of-equilibrium. This part will be performed by our external collaborator, Marco Battiato, from Nanyang Technological University, Singapore (with whom we have submitted an ANR PRCI project in 2018). 2) Bridging the time-resolved population calculations and the measured ARPES spectra systematic theoretical studies will be performed by full-potential photoemission calculations using the spin density matrix formalism and modelling the spin-orbit coupling effects by perturbation theory and monitoring the spin and orbital polarisation in the Bloch spectral functions. This part will be performed by Jan Minar from NTC, University of West Bohemia, Plzen, Czech Republic. 3) Cephise Cacho, from Diamond synchrotron facility (RAL campus), will be a driving force during our experiments at Artemis and ATTOLab thanks to his important experience with HHG laser source experiments. 4) Mauro Fanciuli will join our team in September 2018 as a post-doc. He prepared his PhD thesis at the EPFL Lausanne and at the Suisse synchrotron facility, SLS and obtained financial support from EPFL for 1,5 year post-doctoral stay. b) Transition metal oxides The transition metal oxides are known for their versatile physical properties and are therefore an active field of research towards possible new functionalities and applications. We intend to study titanates with perovskite structure: SrTiO3 (STO), BaTiO3 (BTO) that show a wide range of interesting bulk properties, such as para-, ferro-, and antiferroelectric orders. Since the discovery of a two-dimensional electron gas (2DEG) at the interface and surface of titanates, the interaction of the bulk properties with the 2DEG is of particular interest. Among all the properties shown by titanates, surely magnetism is one of the most surprising, since none of their constituents is actually magnetic. Indeed, spin resolved photoemission experiments on the surface of bare STO revealed the spin-polarization of the 2D-electrons, where two subbands of pure 2D-electrons have helical spin-structure. From the fundamental point of view, magnetism can be used as another parameter to tune the property of the 2DEG at the surface and the control can be achieved by doping with magnetic elements (Cr, Fe). Doping of oxides with transition metals has often been considered as a way to induce a long-range magnetic ordering in a dielectric. However, the reported studies in literature are often controversial and need to be completed. back