Strong-coupling FRG for the U=∞ Hubbard model shows bandwidth and quasiparticle residue decreasing with density, polaronic continua, bad-metal behavior with magnetic correlations, and Luttinger theorem violation above low densities.
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Magnetic fluctuations split the electronic spectrum in the paramagnetic phase of itinerant ferromagnets and altermagnets, closely resembling the ordered-phase DFT bands.
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Functional renormalization group for extremely correlated electrons
Strong-coupling FRG for the U=∞ Hubbard model shows bandwidth and quasiparticle residue decreasing with density, polaronic continua, bad-metal behavior with magnetic correlations, and Luttinger theorem violation above low densities.
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Splitting of electronic spectrum in paramagnetic phase of itinerant ferromagnets and altermagnets
Magnetic fluctuations split the electronic spectrum in the paramagnetic phase of itinerant ferromagnets and altermagnets, closely resembling the ordered-phase DFT bands.