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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.32: Poster
Wednesday, March 14, 2018, 15:00–19:00, Poster B
Variational Cluster Approximation for d4 systems — •Teresa Feldmaier and Maria Daghofer — Institut für funktionelle Materie und Quantentechnologien, Universität Stuttgart, Deutschland
We use the variational cluster approximation to investigate the phase
diagram and one-particle spectral density of multi-band Hubbard models with strong spin-orbit coupling.
The approach includes quantum fluctuations
on a small cluster exactly, where frustration can be treated without
additional complications, and long-range order on a
mean-field level.
We will in particular investigate systems with four electrons per site, where a local singlet competes with itinerant triplet excitations that
can condense into magnetic order.
Further, the competition of Hund’s rule and spin-orbit coupling with crystal-field splitting leads to various phases which are realized in some
iridium and ruthenium compounds.