Ultrafast coherent control of electric currents at metal surfaces

Jens Güdde, Marcus Rohleder, Torsten Meier, Stephan W. Koch, Ulrich Höfer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report the development of an experimental technique to measure the dynamics of electrical currents on the femtosecond timescale. The technique combines methods of coherent control with time- and angle-resolved photoelectron spectroscopy. Direct snapshots of the momentum distribution of the excited electrons as function of time are then determined by photoelectron spectroscopy. In this way we gain information on the generation and decay of ultrashort current pulses in unprecedented detail. In particular, this technique allows the observation of elastic electron scattering in terms of an incoherent population dynamics in momentum space. We have applied this optical current generation and detection scheme to electrons in so-called image-potential states which represent a prototype of two-dimensional electronic surface states. Electrons in these states are bound perpendicular to the metal surface by the Coulombic image potential whereas they can move almost freely parallel to the surface. For the (n=1) image-potential state of Cu(100) we find a decay time of 10 fs due to electron scattering with steps and surface defects.

Original languageEnglish (US)
Title of host publicationUltrafast Phenomena in Semiconductors and Nanostructure Materials XIV
DOIs
StatePublished - May 3 2010
EventUltrafast Phenomena in Semiconductors and Nanostructure Materials XIV - San Francisco, CA, United States
Duration: Jan 24 2010Jan 27 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7600
ISSN (Print)0277-786X

Other

OtherUltrafast Phenomena in Semiconductors and Nanostructure Materials XIV
CountryUnited States
CitySan Francisco, CA
Period1/24/101/27/10

Keywords

  • Coherent control
  • Image-potential states
  • Metal surfaces
  • Time-resolved photoelectron spectroscopy
  • Ultrafast electric currents

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Güdde, J., Rohleder, M., Meier, T., Koch, S. W., & Höfer, U. (2010). Ultrafast coherent control of electric currents at metal surfaces. In Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV [76001K] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7600). https://doi.org/10.1117/12.839672