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K: Fachverband Kurzzeitphysik

K 11: Poster

K 11.3: Poster

Tuesday, March 31, 2009, 17:30–19:30, Foyer des IfP

Non-equilibrium Green function approach to photoionization processes — •David Hochstuhl, Bauch Sebastian, Balzer Karsten, and Bonitz Michael — Institut für theoretische Physik und Astrophysik, Leibnizstraße 15, 24098 Kiel

Recent progress in the experimental investigation of inner-atomic multi-electron processes, such as time-resolved Auger decay [1] and shake up processes by means of time-resolved stong field tunnelling [2] demands for a time-resolved correlated theoretical description.

We present a quantum kinetic approach based on the formalism of non-equilibrium Green functions. Starting from the correlated equilibrium state obtained by the solution of Dyson’s equation, the Keldysh/Kadanoff-Baym equations are solved within the second Born approximation, the first perturbative correction to the Hartree-Fock mean-field.

For an efficient modelling of ionization processes we introduce an approximation scheme, which provides a complete single-particle description of the continuum, while the model atom is considered as correlated. This allows for a systematic time-resolved investigation of the above mentioned effects.

[1] Drescher et al, Nature (London) 419 803–807 (2002)

[2] Uiberacker et al., Nature (London) 446 627–632 (2007)