Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.88: Poster
Friday, April 4, 2014, 10:30–13:30, P2
Dual Boson Approach to Collective Magnetic Excitations in the Hubbard Model — •Friedrich Krien1, Erik van Loon2, Hartmut Hafermann3, Mikhail Katsnelson2, Alexei Rubtsov4, and Alexander Lichtenstein1 — 1Dep. of Physics, University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany — 2Institute for Molecules and Materials, Radboud University of Nijmegen, 6525 AJ Nijmegen, The Netherlands — 3IPhT, CEA, CNRS, 91191 Gif-sur-Yvette, France — 4Dep. of Physics, Moscow State University, 119992 Moscow, Russia
The recently developed dual boson approach is a generalization of the dual fermion theory to study collective excitations in systems of the extended Hubbard model type.
Here we present the implementation scheme that is currently under testing and development by the authors. We reason why its account of collective excitations is also expected to improve the understanding of such in the simpler Hubbard model. We outline the steps to take full account of charge and magnetic excitations within the extended Hubbard model in the future.