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Träfflista för sökning "WFRF:(Kapteyn Henry C.) srt2:(2012-2014)"

Search: WFRF:(Kapteyn Henry C.) > (2012-2014)

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  • Hickstein, Daniel D., et al. (author)
  • Direct Visualization of Laser-Driven Electron Multiple Scattering and Tunneling Distance in Strong-Field Ionization
  • 2012
  • In: Physical Review Letters. - 1079-7114. ; 109:7
  • Journal article (peer-reviewed)abstract
    • Using a simple model of strong-field ionization of atoms that generalizes the well-known 3-step model from 1D to 3D, we show that the experimental photoelectron angular distributions resulting from laser ionization of xenon and argon display prominent structures that correspond to electrons that pass by their parent ion more than once before strongly scattering. The shape of these structures can be associated with the specific number of times the electron is driven past its parent ion in the laser field before scattering. Furthermore, a careful analysis of the cutoff energy of the structures allows us to experimentally measure the distance between the electron and ion at the moment of tunnel ionization. This work provides new physical insight into how atoms ionize in strong laser fields and has implications for further efforts to extract atomic and molecular dynamics from strong-field physics.
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2.
  • Rudolf, Dennis, et al. (author)
  • Ultrafast magnetization enhancement in metallic multilayers driven by superdiffusive spin current
  • 2012
  • In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 3, s. 1037-
  • Journal article (peer-reviewed)abstract
    • Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven by ultrashort light pulses, resulting in a transient drop in magnetization within a few hundred femtoseconds. However, a full understanding of femtosecond spin dynamics remains elusive. Here we spatially separate the spin dynamics using Ni/Ru/Fe magnetic trilayers, where the Ni and Fe layers can be ferroor antiferromagnetically coupled. By exciting the layers with a laser pulse and probing the magnetization response simultaneously but separately in Ni and Fe, we surprisingly find that optically induced demagnetization of the Ni layer transiently enhances the magnetization of the Fe layer when the two layer magnetizations are initially aligned parallel. Our observations are explained by a laser-generated superdiffusive spin current between the layers.
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