DMFT-QE Symposium - Ryotaro Arita (February 5, 2024) 

Using a cluster and diagrammatic extension of the dynamical mean-field theory, we study the single- and two-orbital Hubbard models with strong ferromagnetic (FM) spin fluctuations. We find a significant expansion of the Fermi surface (FS) above the Curie temperature (Tc). While it is natural to see a volume expansion of the majority-spin FS in the FM long-range-ordered metal below Tc, we find a similar spectrum even above Tc in the strong-coupling regime with the large preformed local moment [1,2]. More details: www.simonsfoundation.org/even...

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