Aarhus University Seal / Aarhus Universitets segl

Søren Ulstrup

Time- And momentum-resolved photoemission studies using time-of-flight momentum microscopy at a free-electron laser

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

DOI

  • D. Kutnyakhov, German Electron Synchrotron
  • ,
  • R. P. Xian, Fritz Haber Institute of the Max Planck Society
  • ,
  • M. Dendzik, Fritz Haber Institute of the Max Planck Society
  • ,
  • M. Heber, German Electron Synchrotron
  • ,
  • F. Pressacco, University of Hamburg
  • ,
  • S. Y. Agustsson, Johannes Gutenberg University Mainz
  • ,
  • L. Wenthaus, German Electron Synchrotron
  • ,
  • H. Meyer, University of Hamburg
  • ,
  • S. Gieschen, University of Hamburg
  • ,
  • G. Mercurio, University of Hamburg
  • ,
  • A. Benz, University of Hamburg
  • ,
  • K. Bühlman, Swiss Federal Institute of Technology Zurich
  • ,
  • S. Däster, Swiss Federal Institute of Technology Zurich
  • ,
  • R. Gort, Swiss Federal Institute of Technology Zurich
  • ,
  • D. Curcio
  • K. Volckaert
  • M. Bianchi
  • Ch Sanders, Rutherford Appleton Laboratory
  • ,
  • J. A. Miwa
  • S. Ulstrup
  • A. Oelsner, Surface Concept GmbH
  • ,
  • C. Tusche, Jülich Research Centre, University of Duisburg-Essen
  • ,
  • Y. J. Chen, Forschungszentrum Jülich GmbH, Jülich Research Centre, Fakultät für Physik, University of Duisburg-Essen
  • ,
  • D. Vasilyev, Johannes Gutenberg University Mainz
  • ,
  • K. Medjanik, Johannes Gutenberg University Mainz
  • ,
  • G. Brenner, German Electron Synchrotron
  • ,
  • S. Dziarzhytski, German Electron Synchrotron
  • ,
  • H. Redlin, German Electron Synchrotron
  • ,
  • B. Manschwetus, German Electron Synchrotron
  • ,
  • S. Dong, Fritz Haber Institute of the Max Planck Society
  • ,
  • J. Hauer, Fritz Haber Institute of the Max Planck Society
  • ,
  • L. Rettig, Fritz Haber Institute of the Max Planck Society
  • ,
  • F. Diekmann, Kiel University
  • ,
  • K. Rossnagel, German Electron Synchrotron, Kiel University
  • ,
  • J. Demsar, Johannes Gutenberg University Mainz
  • ,
  • H. J. Elmers, Johannes Gutenberg University Mainz
  • ,
  • Ph Hofmann
  • R. Ernstorfer, Fritz Haber Institute of the Max Planck Society
  • ,
  • G. Schönhense, Johannes Gutenberg University Mainz
  • ,
  • Y. Acremann, Swiss Federal Institute of Technology Zurich
  • ,
  • W. Wurth, German Electron Synchrotron, University of Hamburg

Time-resolved photoemission with ultrafast pump and probe pulses is an emerging technique with wide application potential. Real-time recording of nonequilibrium electronic processes, transient states in chemical reactions, or the interplay of electronic and structural dynamics offers fascinating opportunities for future research. Combining valence-band and core-level spectroscopy with photoelectron diffraction for electronic, chemical, and structural analyses requires few 10 fs soft X-ray pulses with some 10 meV spectral resolution, which are currently available at high repetition rate free-electron lasers. We have constructed and optimized a versatile setup commissioned at FLASH/PG2 that combines free-electron laser capabilities together with a multidimensional recording scheme for photoemission studies. We use a full-field imaging momentum microscope with time-of-flight energy recording as the detector for mapping of 3D band structures in (kx, ky, E) parameter space with unprecedented efficiency. Our instrument can image full surface Brillouin zones with up to 7 Å-1 diameter in a binding-energy range of several eV, resolving about 2.5 × 105 data voxels simultaneously. Using the ultrafast excited state dynamics in the van der Waals semiconductor WSe2 measured at photon energies of 36.5 eV and 109.5 eV, we demonstrate an experimental energy resolution of 130 meV, a momentum resolution of 0.06 Å-1, and a system response function of 150 fs.

Original languageEnglish
Article number013109
JournalReview of Scientific Instruments
Volume91
Issue1
Number of pages12
ISSN0034-6748
DOIs
Publication statusPublished - 2020

See relations at Aarhus University Citationformats

ID: 190954354