Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

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.