0000000000191536

AUTHOR

Wilfried Wurth

showing 4 related works from this author

Correction of the deterministic part of space–charge interaction in momentum microscopy of charged particles

2015

Abstract Ultrahigh spectral brightness femtosecond XUV and X-ray sources like free electron lasers (FEL) and table-top high harmonics sources (HHG) offer fascinating experimental possibilities for analysis of transient states and ultrafast electron dynamics. For electron spectroscopy experiments using illumination from such sources, the ultrashort high-charge electron bunches experience strong space–charge interactions. The Coulomb interactions between emitted electrons results in large energy shifts and severe broadening of photoemission signals. We propose a method for a substantial reduction of the effect by exploiting the deterministic nature of space–charge interaction. The interaction…

Free electron modelPhysicsMomentumPhase spaceDESYElectronAtomic physicsInstrumentationSpace chargeElectron spectroscopyAtomic and Molecular Physics and OpticsCharged particleElectronic Optical and Magnetic MaterialsUltramicroscopy
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Observation of an excitonic Mott transition through ultrafast core-cum-conduction photoemission spectroscopy

2020

Time-resolved soft-X-ray photoemission spectroscopy is used to simultaneously measure the ultrafast dynamics of core-level spectral functions and excited states upon excitation of excitons in WSe$_2$. We present a many-body approximation for the Green's function, which excellently describes the transient core-hole spectral function. The relative dynamics of excited-state signal and core levels reveals a delayed core-hole renormalization due to screening by excited quasi-free carriers, revealing an excitonic Mott transition. These findings establish time-resolved core-level photoelectron spectroscopy as a sensitive probe of subtle electronic many-body interactions and an ultrafast electronic…

Time ResolvedPhase transitionMaterials sciencePhotoemission spectroscopyExcitonFOS: Physical sciencesGeneral Physics and Astronomy01 natural sciencesMolecular physicsCondensed Matter - Strongly Correlated ElectronsCore PhysicsX-ray photoelectron spectroscopyMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesddc:530010306 general physicsNon-equilibriumCondensed Matter - Materials ScienceSettore FIS/03Strongly Correlated Electrons (cond-mat.str-el)Condensed Matter - Mesoscale and Nanoscale PhysicsMaterials Science (cond-mat.mtrl-sci)3. Good healthMott transitionExcited stateMany-BodyUltrashort pulseExcitation
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4D texture of circular dichroism in soft-x-ray photoemission from tungsten

2019

Brief treatment and crisis intervention 21(1), 013017 (2019). doi:10.1088/1367-2630/aaf4cd

PhysicsCircular dichroismPhotonW(110)Binding energy370General Physics and AstronomyPolarimeter01 natural sciencesMolecular physicsToF momentum microscopySymmetry (physics)010305 fluids & plasmascircular dichroismBrillouin zoneMomentumphotoemission; soft x-rays; circular dichroism; W(110); ToF momentum microscopy0103 physical sciencessoft x-raysddc:530010306 general physicsphotoemissionSurface states
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Time-resolved core-level photoemission data of tungsten diselenide

2020

Pump-probe core-level photoemission spectroscopy data of tungsten diselenide (WSe2) measured using an electron momentum microscope at the FLASH Free-electron laser.

photoemission spectroscopyXPSPhysics::Optics2D materialpump-probe spectroscopyfree electron laser
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