Pairing Tendencies in a Two-orbital Hubbard Model in One Dimension

Abstract

The recent discovery of superconductivity under high pressure in the ladder compound BaFe${}_2$S${}_3$ has opened a new field of research in iron-based superconductors with focus on quasi one-dimensional geometries. In this publication, using the Density Matrix Renormalization Group technique, we study a two-orbital Hubbard model defined in one dimensional chains. Our main result is the presence of hole binding tendencies at intermediate Hubbard $U$ repulsion and robust Hund coupling $J_H/U=0.25$. Binding does not occur neither in weak coupling nor at very strong coupling. The pair-pair correlations that are dominant near half-filling, or of similar strength as the charge and spin correlation channels, involve hole-pair operators that are spin singlets, use nearest-neighbor sites, and employ different orbitals for each hole. The Hund coupling strength, presence of robust magnetic moments, and antiferromagnetic correlations among them are important for the binding tendencies found here.

References in corpus (10)

• Theory of Intertwined Orders in High Temperature Superconductors
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Evidence for Strong Itinerant Spin Fluctuations in the Normal State of CeFeAsO(0.89)F(0.11) Iron-Oxypnictides
• Pair Density Wave correlations in the Kondo-Heisenberg Model
• BaFe${}_2$Se${}_3$: a high $T_{\mathrm{C}}$ magnetic multiferroic with large ferrielectric polarization
• Magnetic States of the Two-Leg Ladder Alkali Metal Iron Selenides $A$Fe${}_2$Se${}_3$
• Robust d-wave Pairing Correlations in the Heisenberg Kondo Lattice Model
• Magnetic states of the five-orbital Hubbard model for one-dimensional iron-based superconductors
• Pair Density Waves in coupled doped two-leg Ladders
• Superconductivity in a model of two Hubbard chains coupled with ferromagnetic exchange interaction

Cited by in corpus (16)

• Sequential structural and antiferromagnetic transitions in BaFe${}_2$Se${}_3$ under pressure
• Electronic structure, magnetic correlations, and superconducting pairing in the reduced Ruddlesden-Popper bilayer La${}_3$Ni${}_2$O${}_6$ under pressure: different role of $d_{3z^2-r^2}$ orbital compared with La${}_3$Ni${}_2$O${}_7$
• Interaction-induced topological phase transition and Majorana edge states in low-dimensional orbital-selective Mott insulators
• Pair-density-wave superconductor from doping Haldane chain and rung-singlet ladder
• Prediction of exotic magnetic states in the alkali metal quasi-one-dimensional iron selenide compound Na${}_2$FeSe${}_2$
• Range of biquadratic and triquadratic Heisenberg effective couplings deduced from multiorbital Hubbard models
• Spectroscopic signatures of next-nearest-neighbor hopping in the charge and spin dynamics of doped one-dimensional antiferromagnets
• Quantum magnetism of iron-based ladders: Blocks, spirals, and spin flux
• Intertwined charge, spin, and pairing orders in doped iron ladders
• Excitonic density-waves, bi-excitons and orbital selective pairing in two-orbital correlated chains
• Topological and magnetic properties of the interacting Bernevig-Hughes-Zhang model
• Luther-Emery liquid and dominant singlet superconductivity in the hole-doped Haldane spin-1 chain
• Intertwined charge, spin, and orbital degrees of freedom under electronic correlations in the one-dimensional Fe${}^{3+}$ chalcogenide chain
• Coupled Hubbard ladders at weak coupling: Pairing and spin excitations
• Evidence for valence-bond pairing in a one-dimensional two-orbital system
• Quasi-one-dimensional spin excitations in the iron pnictide NaFe${}_{0.53}$Cu${}_{0.47}$As