Daily Overview: Today’s highlight focuses on advancing the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], a theoretical study based on a two-leg t-J-J⊥ ladder model reveals the existence of a generalized Luther-Emery liquid phase under finite layer polarization, which exhibits incommensurate pairing density wave correlations. This phase features a finite spin gap, with interlayer pairing correlations displaying FFLO-like oscillations, and the iC-PDW state remains robust across a wide range of doping and polarization. The authors specifically note that this model is highly relevant to the physical picture of the bilayer nickelate La₃Ni₂O₇, offering a new theoretical perspective for understanding the pairing mechanism in such nickel-based superconducting systems. arXiv submission processing window: 2026-02-04 19:00 to 2026-02-04 19:00 UTC.
1. Incommensurate pair-density-wave correlations in two-leg ladder $t$–$J$–$J_\perp$ model
- Relevance Score:
4.3640 - Authors: Hanbit Oh, Julian May-Mann, Ya-Hui Zhang
- Link: http://arxiv.org/abs/2602.04945v1
Summary: In the two-leg t-J-J⊥ ladder model, by tuning the interlayer electric potential difference to introduce finite layer polarization, combined with density matrix renormalization group simulations and bosonization analysis, a generalized Luther-Emery liquid phase is discovered, which exhibits incommensurate pairing density wave correlations. This phase possesses a finite spin gap, and the interlayer pairing correlations display FFLO-like oscillations, with the period determined by the difference in Fermi momenta between the two legs; the intralayer pairing correlations arise from the coupling of charge fluctuations in one layer with spin fluctuations in the other, with momentum equal to twice the Fermi momentum of the opposite layer. The iC-PDW state remains robust over a wide range of doping and polarization, but the introduction of a finite interlayer hopping leads to its destabilization, potentially toward a charge-4e pairing phase. The study also discusses the experimental feasibility of this model on optical lattice platforms and its connection to the bilayer nickelate La₃Ni₂O₇.