Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.47: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Magnetic Ordering and Superconductivity in Triangular Lattices in the Hubbard Model — Maria Daghofer and •André Fischer — IFW Dresden, Dresden, Germany

The 2D triangular lattice provides a simple model with intrinsic geometric frustration and is therefore well suited to study effects induced by electronic interactions. The aim of this work is to find possible ground state scenarios at the van-Hove filling within the Hubbard model, taking various magnetically ordered states and superconducting states into account. Using cluster perturbation theory allows us to tread the system on a level beyond mean field theory. We find a superconducting phase with unconventional symmetry to be the supported ground state in a wide parameter regime. A comparison of selected magnetically ordered states does not show a support of a previously proposed chiral phase.