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  • Title: Ultrafast modulation of electronic structure by coherent phonon excitations.
    Author: Weisshaupt J, Rouzée A, Woerner M, Vrakking MJJ, Elsaesser T, Shirley EL, Borgschulte A.
    Journal: Phys Rev B; 2017 Feb 01; 95(8):. PubMed ID: 38618525.
    Abstract:
    Femtosecond x-ray absorption spectroscopy with a laser-driven high-harmonic source is used to map ultrafast changes of x-ray absorption by femtometer-scale coherent phonon displacements. In LiBH4, displacements along an Ag phonon mode at 10 THz are induced by impulsive Raman excitation and give rise to oscillatory changes of x-ray absorption at the Li K-edge. Electron density maps from femtosecond x-ray diffraction data show that the electric field of the pump pulse induces a charge transfer from the BH4- to neighboring Li+ ions, resulting in a differential Coulomb force that drives lattice vibrations in this virtual transition state.
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