Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.68: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Ultrafast dynamics of correlated fermions in lattice systems: Spectral properties — •Jan-Philip Joost, Niclas Schlünzen, and Michael Bonitz — CAU Kiel, Germany

The spectral properties of the infinite 1D Hubbard chain in the ground state can be described exactly by the Bethe ansatz [1]. However, for higher dimensional systems or the description of dynamical processes this spectral analysis becomes a challenging task. The nonequilibrium Green functions [2] (NEGF) approach grants easy access to the time-resolved spectral properties of extended and strongly correlated systems and is therefore well-suited to fill this gap [3]. Here, we present time-dependent and spatially resolved results for the spectral function and the dispersion relation of 1D and 2D systems in the ground state as well as for various nonequilibrium excitations. From a methodological point of view we compare different many body approaches, including the second Born, T-matrix and the third order approximation.
[1] F. H. L. Essler et al., The One-Dimensional Hubbard Model (Cambridge University Press, 2005)
[2] K. Balzer and M. Bonitz, Lect. Notes Phys. 867 (2013)
[3] N. Schlünzen et al., Phys. Rev. B 93, 035107 (2016)