Dr. Claudio Mazzoli, Brookhaven National Laboratory

Title: Coherent REXS: a journey across space AND time of electronic orderings in some correlated material

Abstract: The investigation of electronic structures in the space domain is crucial for understanding their hierarchical relationships and functional behavior. On the other hand, the study in the time-frequency domain discloses the underlying energetics, thus paving the way to their fundamental modeling. As a result, any comprehensive understanding of the complexity expressed by correlated systems has to deal with both these domains. From an experimental point of view, however, often drastic compromises are needed to access and retrieve relevant information in space or in time. As a matter of fact, a gain in one domain typically corresponds to a loss in the other.

In the first part of my talk, I will introduce the specific point of view oCered by Resonant Elastic X-ray Scattering (REXS) under coherent illumination and present some relevant examples in either of the two domains. In the second part of my talk, I will concentrate on advances allowed by a frontier use of coherence, showcasing extremes where previously inaccessible scientific information can now be retrieved in space (fullfield lensless), time (direct space imaging and its comparison to XPCS), or both together (correlative imaging). The conclusions will highlight the potential impact of these advanced methods to a variety of systems, sources and techniques, allowing to deepen our understanding of this broad class of materials, and hopefully inspire other innovative approaches for the exploitation of coherence.