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$t$-$J$ model for strongly correlated two-orbital systems: Application to bilayer nickelate superconductors
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abstract
We derive a $t$-$J$ model applicable to strongly correlated two-orbital systems including bilayer nickelate superconductors. Using the Schrieffer-Wolff transformation, we exclude the doubly occupied states, which raise the onsite Coulomb energy, and derive the resulting spin interactions from the two-orbital Hubbard model. We also introduce effective interactions attributed to the interorbital Coulomb interaction. To adapt the effective model to bilayer nickelates that exhibit high-temperature superconductivity, we quantitatively evaluate the strengths of the spin interactions based on the hopping parameters in La$_3$Ni$_2$O$_7$. Considering the evaluated effective interactions, we propose a simplified $t$-$J$ model for bilayer nickelate superconductors.
Forward citations
Cited by 2 Pith papers
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Pairing without $\gamma$-Pocket in the La$_3$Ni$_2$O$_7$ Thin Film
Even without the γ-pocket, spin-fluctuation and superexchange mechanisms both yield s±-wave pairing in the La3Ni2O7 thin film, with interlayer d_x2-y2 pairing dominant.
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Doping a spin-one Mott insulator: possible application to bilayer nickelate
A review of the authors' prior theoretical work proposing that bilayer spin-one Mott insulators with strong interlayer coupling can host kinetic-energy-driven high-Tc superconductivity and a second Fermi liquid normal state.
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