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Ultrafast Low-Energy Photoelectron Diffraction for the Study of Surface-Adsorbate Interactions with 100-fs Temporal Resolution.
Phys Rev Lett
November 2024
Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany.
A novel method of ultrafast electron diffraction for the study of structural dynamics at surfaces is presented. The probing electron pulse is generated in the immediate vicinity of the surface by photoemission of low-energy electrons from the sample substrate. This limits the propagation distance of the electron pulse before diffraction to a few nanometers and thus minimizes pulse broadening effects due to space charge and dispersion.
View Article and Find Full Text PDFOn the engineering of higher-order Van Hove singularities in two dimensions.
Nat Commun
November 2024
Department of Physics and Centre for the Science of Materials, Loughborough University, Loughborough, UK.
The properties of correlated electron materials are often intricately linked to Van Hove singularities (VHS) in the vicinity of the Fermi energy. The class of these VHS is of great importance, with higher-order ones-with power-law divergence in the density of states-leaving frequently distinct signatures in physical properties. We use a new theoretical method to detect and analyse higher-order VHS (HOVHS) in two-dimensional materials and apply it to the electronic structure of the surface layer of SrRuO.
View Article and Find Full Text PDFAttosecond formation of charge-transfer-to-solvent states of aqueous ions probed using the core-hole-clock technique.
Nat Commun
October 2024
Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20, Uppsala, Sweden.
Charge transfer between molecules lies at the heart of many chemical processes. Here, we focus on the ultrafast electron dynamics associated with the formation of charge-transfer-to-solvent (CTTS) states following X-ray absorption in aqueous solutions of Na, Mg, and Al ions. To explore the formation of such states in the aqueous phase, liquid-jet photoemission spectroscopy is employed.
View Article and Find Full Text PDFAttosecond chronoscopy of the photoemission near a bandgap of a single-element layered dielectric.
Sci Adv
June 2024
Physik Department, Technische Universität München, Garching, 85748, Germany.
We report on the energy dependence of the photoemission time delay from the single-element layered dielectric HOPG (highly oriented pyrolytic graphite). This system offers the unique opportunity to directly observe the Eisenbud-Wigner-Smith (EWS) time delays related to the bulk electronic band structure without being strongly perturbed by ubiquitous effects of transport, screening, and multiple scattering. We find the experimental streaking time shifts to be sensitive to the modulation of the density of states in the high-energy region ( ≈ 100 eV) of the band structure.
View Article and Find Full Text PDFWeyl spin-momentum locking in a chiral topological semimetal.
Nat Commun
May 2024
Max Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120, Halle, Germany.
Spin-orbit coupling in noncentrosymmetric crystals leads to spin-momentum locking - a directional relationship between an electron's spin angular momentum and its linear momentum. Isotropic orthogonal Rashba spin-momentum locking has been studied for decades, while its counterpart, isotropic parallel Weyl spin-momentum locking has remained elusive in experiments. Theory predicts that Weyl spin-momentum locking can only be realized in structurally chiral cubic crystals in the vicinity of Kramers-Weyl or multifold fermions.
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