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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Using FRG with fixed volume, the work recovers constrained Ising fixed points and shows that renormalized Ising and spherical fixed points yield a negative anomalous dimension for strain, implying non-analytic corrections to Hooke's law while Ising criticality is preempted by bulk instability.
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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 approach to phonon modified criticality: anomalous dimension of strain and non-analytic corrections to Hooke's law
Using FRG with fixed volume, the work recovers constrained Ising fixed points and shows that renormalized Ising and spherical fixed points yield a negative anomalous dimension for strain, implying non-analytic corrections to Hooke's law while Ising criticality is preempted by bulk instability.