Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.16: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Versatile approach to the spin dynamics of correlated electrons — Malte Behrmann1, Alexander I. Lichtenstein1, Mikhail I. Katsnelson2, and •Frank Lechermann3 — 1I. Institut für Theoretische Physik, Universität Hamburg, 20355 Hamburg — 2Radboud University Nijmegen, Institute for Molecules and Materials, NL-6525 AJ Nijmegen, The Netherlands — 3Institut für Keramische Hochleistungswerkstoffe, Technische Universität Hamburg-Harburg, 21073 Hamburg
Most theoretical approaches to time-dependent magnetism in condensed matter either focus on the spin-only limit or rely on a weak-correlation treatment based on band theory. However many experimental studies deal with itinerant local-moment systems, where the intricate coupling between spin and charge excitations within a moderate-to-strong correlation regime plays an important role. We thus here present a novel real-space treatment of the non-equilibrium Hubbard model, suitable to address correlated spin dynamics ranging from the Stoner to the Heisenberg limit. It is based on the time-dependent rotational-invariant slave-boson scheme [1], allowing to keep track of both, local-moment as well as itinerant degrees of freedom. The antiferromagnetic spin-wave spectrum at half filling is obtained in the linear-response limit of the generic non-adiabatic framework. Various examples with and without doping demonstrate the capabilities and potential of the methodology.
[1] M. Behrmann, M. Fabrizio and F. Lechermann, PRB 88, 035116 (2013)