Ghost-RISB is generalized to electron-phonon systems and reproduces DMFT benchmarks on the Hubbard-Holstein model, showing that superconducting order is suppressed by a phonon-overlap (Franck-Condon) factor in the bipolaronic regime.
Fractionalized Fermi liquids with the ghost-Gutzwiller Ansatz
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abstract
Fractionalized Fermi liquids ($\mathrm{FL}^{\!*}$), elusive metallic states characterized by fractionalized quasiparticles alongside conventional ones and defying Luttinger's theorem, are prime candidates for the pseudogap regime of underdoped cuprates. We show that a $\mathrm{FL}^{\!*}$ phase emerges in the single-band $t$-$J$ model through a simple ghost-Gutzwiller Ansatz, optimized at the cost of a mean-field calculation. The resulting temperature-doping phase diagram encompasses a low-doping $\mathrm{FL}^{\!*}$, a $d$-wave superconducting dome, and an overdoped conventional Fermi liquid, thereby reproducing key qualitative features of cuprate phenomenology.
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Ghost-RISB for Correlated Electron-Phonon Systems: Application to the Hubbard-Holstein Model
Ghost-RISB is generalized to electron-phonon systems and reproduces DMFT benchmarks on the Hubbard-Holstein model, showing that superconducting order is suppressed by a phonon-overlap (Franck-Condon) factor in the bipolaronic regime.