Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.43: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

Linear-Response charge dynamics of the Hubbard model from the time-dependent Gutzwiller approximation — •Katharina Noatschk and Götz Seibold — Institut für Physik, BTU Cottbus-Senftenberg, Postfach 101344, 03013 Cottbus, Germany

The time dependent Gutzwiller approximation for the Hubbard model is obtained from the Lagrangian equation of motion for the density matrix and variational parameters. Expansion of the resulting equations up to second order in these dynamical variables yields an effective electron-boson problem where the bosons represent fluctuations of the double occupancy [1]. Within this formalism we investigate the charge excitations of the single-band Hubbard model for parameters relevant for cuprate superconducters. We also supplement the model with long-range Coulomb interaction and compare resulting excitations with experimental data from electron loss spectroscopy.
J. Bünemann, M. Capone, J. Lorenzana, G. Seibold, New J. Phys., 2013