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.
Wetterich,Exact evolution equation for the effective potential, Phys
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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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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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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.