Extended fRG calculation of the infinite-U Hubbard model on the square lattice yields a density-driven sequence of paramagnetic Fermi liquid, antiferromagnetic stripe, and Nagaoka ferromagnetic phases, with the ferromagnet displaying an incoherent flat band and two regimes separated by a Lifshitz 2D
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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.
Magnetic instabilities in generic two-orbital systems are governed by the full interplay of the bare susceptibility tensor and spin interaction matrix, not solely by the quantum geometry of a single-channel susceptibility.
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Bad metal behavior and Lifshitz transition of a Nagaoka ferromagnet
Extended fRG calculation of the infinite-U Hubbard model on the square lattice yields a density-driven sequence of paramagnetic Fermi liquid, antiferromagnetic stripe, and Nagaoka ferromagnetic phases, with the ferromagnet displaying an incoherent flat band and two regimes separated by a Lifshitz 2D
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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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Reevaluating Quantum Geometric Criteria for Itinerant Magnetic Instabilities
Magnetic instabilities in generic two-orbital systems are governed by the full interplay of the bare susceptibility tensor and spin interaction matrix, not solely by the quantum geometry of a single-channel susceptibility.