Berlin 2015 – wissenschaftliches Programm
TT 71.79: Poster
Mittwoch, 18. März 2015, 15:00–18:00, Poster B
Non-local spin correlations in strongly interacting electron systems — •Friedrich Krien1, Erik G. C. P. van Loon2, Hartmut Hafermann3, A.N. Rubtsov4, and A.I. Lichtenstein1 — 1I. Institute of theoretical Physics, University of Hamburg, 20355 Hamburg, Germany — 2Radboud University Nijmegen, Institute for Molecules and Materials, NL-6525 AJ Nijmegen, The Netherlands — 3Institut de Physique Theorique (IPhT), CEA, CNRS, 91191 Gif-sur-Yvette, France — 4Department of Physics, Moscow State University, 119991 Moscow, Russia
We investigate a modified Hubbard model with non-local spin-spin coupling by means of EDMFT and the recently developed Dual Boson approach. Severe complications in the underlying impurity model are circumvented by coupling impurity spins only to spin waves along the z-axis. We develop and apply an approximation to optimally recover the impurity susceptibilities of the desired rotationally invariant system.