Theory of Pump-Probe Ultrafast Photoemission Spectra

  • Takashi FujikawaEmail author
  • Kaori Niki
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 204)


Keldysh Green’s function approach is used in order to derive a practical formula to study pump-probe ultrafast photoemission spectra. The pump pulse is strong whereas the probe pulse can be treated by use of a perturbation theory: We expand the full Green’s function in terms of electron-probe pulse interaction and renormalized Green’s function including pump pulse excitation. Random Phase Approximation (RPA)-boson approach is introduced to estimate some important factors. Well above the edge, ultrafast photoelectron diffraction provides us with information on the transient structural change after the pump pulse excitation. In addition to these slow processes, the rapid oscillation plays an important role related to electronic excitation by pump pulse.


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Graduate School of Advanced Integration ScienceChiba UniversityInage, ChibaJapan

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