Simulations of the 3D Hubbard-Holstein model at half-filling find antiferromagnetic and charge-ordered insulators separated by a first-order transition with no intervening metal, plus metallic bipolaronic states and pseudogap features at higher temperatures.
Dupuis, Spin fluctuations and pseudogap in the two-dimensional half-filled Hubbard model at weak coupling, Phys
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SU(2) gauge theory plus DMFT with long-wavelength magnetic fluctuations produces damping asymmetry in chargon hole pockets that forms Fermi arcs in the underdoped regime.
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Magnetotransport and Phase competition in three-dimensional Hubbard-Holstein model at half-filling
Simulations of the 3D Hubbard-Holstein model at half-filling find antiferromagnetic and charge-ordered insulators separated by a first-order transition with no intervening metal, plus metallic bipolaronic states and pseudogap features at higher temperatures.
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The pseudogap in high-$T_c$ superconductors from SU(2) gauge symmetry and dynamic correlation effects
SU(2) gauge theory plus DMFT with long-wavelength magnetic fluctuations produces damping asymmetry in chargon hole pockets that forms Fermi arcs in the underdoped regime.