Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.69: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Time-resolved Auger electron spectroscopy — •Roman Rausch and Michael Potthoff — I. Institut für Theoretische Physik, Universität Hamburg

Motivated by the recent time-resolved measurements of Auger spectra, we develop a theory of time-resolved Auger electron spectroscopy (AES) for strongly correlated many-body systems. The temporal correlation of the two conduction-band holes in the final state is described within the framework of the Hubbard model, extended by core states to account for the dynamics of core-hole screening. Using a numerically exact Chebyshev polynomial expansion technique (kernel polynomial method) in the low hole-density limit, the time-dependent cross section is computed for different setups. We also discuss the time-dependence of correlation-induced satellites, the validity of a two-step description and the effects resulting from a non-perturbative treatment of the Auger process.