Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Ultrafast Electron and Spin Dynamics
O 75.8: Vortrag
Mittwoch, 22. März 2017, 16:45–17:00, TRE Phy
Recent developments in the one-step description of time-resolved photoemission — •Jürgen Braun1, Michael Potthoff2, and Hubert Ebert1 — 1Dept. Chemie, LMU Universität München, Germany — 2I. Institut für Theoretische Physik, Universität Hamburg, Germany
Recently a theoretical frame for the description of pump-probe photoemission has been
developed. The approach is based on a general formulation using the Keldysh formalism
for the lesser Green function to describe the real-time evolution of the electronic
degrees of freedom in the initial state after a strong pump pulse that drives a system
out of equilibrium [1]. As a first application, the theoretical description of two-photon
photoemission (2PPE) for Ag(100) within the SPR-KKR-approach is briefly reviewed [2].
This formalism has now been generalized to the ferromagnetic case. First examples of
fully spin-polarized 2PPE calculations on Fe(110) will be presented. Finally, a new
approach is sketched that allows to account also for dynamical correlations in the
non-equilibrium state caused by the pump pulse by means of a corresponding two-time
dependent self-energy Σ(z,z′).
[1] J. Braun, R. Rausch, M. Potthoff, J. Minar, and H. Ebert, Pump-probe theory of
angle-resolved photoemission, Phys. Rev. B 91, 035119 (2015)
[2] J. Braun, R. Rausch, M. Potthoff , and H. Ebert, One-step theory of two-photon photoemission, Phys. Rev. B 94, 125128 (2016)