Description
10 min Poster Presentation from Young Scientists
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Enrico Massimiliano Allaria (Elettra Sincrotrone Trieste)Poster
With the completion of the early phase of the FERMI 2.0 upgrade program, the FERMI facility has significantly increased its flexibility, enabling an important extension of its operational capabilities. The redefined FEL-1 layout, supporting both HGHG and EEHG operation modes, has substantially broadened the FEL-1 tuning range. This advancement is accompanied by improved spectral brightness and...
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Dr Francesco Guzzi (Elettra Sincrotrone Trieste)Poster
Coherent diffraction imaging (CDI) and ptychography often suffer from the ill-posed nature of phase retrieval, particularly under low-dose, sparse-sampling, or missing-data conditions. This work examines several computational strategies leveraging Artificial Intelligence (AI) to improve reconstruction robustness in these scenarios. First, we implement a modern automatic differentiation-based...
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Emanuele Pedersoli (Elettra Sincrotrone Trieste)Poster
We report about the recent progress in imaging experiments performed at the DiProI end-station [1], the Coherent Diffraction Imaging (CDI) instrument of the FERMI seeded Free Electron Laser (FEL) user facility [2].
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The mini-TIMER split and delay unit [3] offers the possibility to tomographically illuminate the sample from two different view angles, for stereoscopic imaging [4].
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Filippo Bencivenga (Elettra Sincrotrone Trieste)Poster
Collective dynamics at the nanoscale in condensed matter is important for advancing both fundamental science and modern technology. The study of heat transport processes, vibrational modes or magnetization dynamics in the sub-100 nm length-scales greatly benefit from experimental tools able to probe such dynamics on the relevant timescale (i.e. ps and sub-ps) without relying on ad hoc sample’s...
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Marco Zangrando (Elettra Sincrotrone Trieste and CNR-IOM)Poster
The extension of the FERMI free-electron laser toward shorter wavelengths (FERMI 2.0) challenges the performance of the Photon Analysis Delivery and Reduction System (PADReS), originally optimized for operation above a few nanometers.
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At λ < 5 nm, photon transport efficiency and diagnostic capability are limited by reduced mirror reflectivity, gas transparency in intensity monitors, and the... -
Julian Max Salchegger (Johannes Kepler University Linz)Poster
Transition-metal dichalcogenides exhibit a range of exploitable properties, including the chiral magnetic effect, orbital Hall effect (OHE), type-II Dirac cones that break the Lorentz invariance, and topologically non-trivial surface states. Understanding the nature of the charge carriers and the electronic structure of the Dirac semimetal $\text{PtSe}_2$, which offers both air-stability and...
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Fatih Žgalj (University of Sarajevo)Poster
We investigate strong-field processes in noble-gas atoms driven by intense laser fields in the presence of an additional terahertz (THz) field. Particular emphasis is placed on above-threshold ionization (HATI), where the combined fields enable control over electron trajectories and final momentum distributions. By tuning the relative delay and strength of the THz field, we demonstrate...
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Sebastião Antunes (CFEL, DESY; IFJ)Poster
The principle behind light-induced switching, which is used in modern electronic devices, is the modulation of a light signal in an externally modified medium. This allows for real-time control of the signal's phase, amplitude, or polarization. In this study, we theoretically examine transient changes in the optical polarization of wide-bandgap semiconductors irradiated by femtosecond XUV...
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Zeinab Ebrahimpour (Elettra Sincrotrone Trieste)Poster
Silicon undergoes a sub-picosecond non-thermal melting transition when excited by intense femtosecond laser pulses. This talk demonstrates how soft X-ray absorption spectroscopy (XAS), performed at the seeded FERMI free-electron laser (FEL), effectively captures this process by resolving the ultrafast electronic structure dynamics of silicon with a temporal resolution on the 10 fs...
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Alberto Simoncig (Elettra Sincrotrone Trieste)Poster
The ultrafast X-ray science community is looking for new spectroscopical layouts capable of disclosing how out of equilibrium states of matter rise and relax, as proof of principle schemes to achieve new insight on the mechanisms responsible for driving novel phases of matter.
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Specifically, the advent of free-electron lasers (FELs) paves the way to the implementation of XUV-XUV time-resolved...