BEGIN:VCALENDAR METHOD:PUBLISH PRODID:www-ww-tf-fau-eu//Events//EN VERSION:2.0 BEGIN:VEVENT SUMMARY:WW-Colloquium: Prof. Georgios Varnavides - Dose-Efficient Diff ractive Imaging with Electrons UID:040000008200E00074C5B7101A82E00800000000801D1809754DDC010000000000 000000100000006C0D7D4919519A469C53E6C1CB2455A7 DESCRIPTION:Prof. Georgios Varnavides Delft University of Technology\, Netherlands Dose-Efficient Diffractive Imaging with Electrons High-re solution characterization underpins modern materials science\, linking structure and dynamics across length scales. Yet\, while structural i maging has advanced dramatically\, mapping functional fields–\;su ch as charge\, heat\, and spin currents–\;at comparable resolutio n remains a major challenge. Many materials of interest\, from quantum heterostructures to biological and soft matter systems\, are further limited by weak scattering or radiation sensitivity. More dose-efficie nt imaging approaches are therefore essential\, both to reveal fragile nanoscale order and to probe subtle transport and quantum phenomena. In this interactive talk\, I will introduce computational diffractive imaging with electrons–\;a framework that reconstructs informatio n from scattered electron patterns using physics-based inverse algorit hms–\;as a pathway to overcome these limitations. I will frame th e method as an inverse scattering problem and compare the efficiency a nd sensitivity of various computational imaging strategies. Particular emphasis will be placed on their implications for time-resolved studi es and for imaging quantum and functional materials. I will highlight the conceptual connection between iterative and direct ptychography\, show how tilt-corrected bright-field STEM emerges as a quadratic appro ximation to direct ptychography\, and present a new algorithm that ena bles robust information recovery from sub-sampled measurements. DTSTART:20251104T150000Z DTEND:20251104T170000Z LOCATION:H14 / Zoom DTSTAMP:20260414T112307Z END:VEVENT END:VCALENDAR