Luttinger Liquid Behavior in a Single-Layer Nickelate La1.4Sr0.6NiO4

Abstract

The discovery of high-temperature superconductivity in bilayer and trilayer nickelates has spurred intense interest in the Ruddlesden-Popper nickelates; yet the fundamental properties of the NiO2 layer remain obscured by interlayer coupling. It is therefore imperative to investigate the electronic properties of their single-layer counterpart to isolate the intrinsic physics of the NiO layer. In this work, we present a systematic study of the single-layer nickelate La1.4Sr0.6NiO4 using high-resolution angle-resolved photoemission spectroscopy (ARPES) and theoretical calculations. We reveal strong electron correlation effects, manifested by high-energy kinks in band dispersions and a pronounced orbital-dependent band renormalization. Interestingly, we observe a quasi-one-dimensional electronic structure characterized by straight Fermi surface sheets along the diagonal momentum directions. Such square Fermi surface topology facilitates non-Fermi liquid behavior consistent with the Luttinger liquid model, as evidenced by the power-law spectral function, robust temperature scaling, and the observation of spin-charge separation. Our results therefore not only unveil an exotic Luttinger liquid behavior emerging from the unexpected dimensional reduction in an intrinsically quasi-two-dimensional nickelate but also provide a new perspective for understanding the intriguing physics in multilayer nickelates.

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BibTeX RIS

BibTeX

@misc{hu2026luttinger,
  title = {{Luttinger Liquid Behavior in a Single-Layer Nickelate La1.4Sr0.6NiO4}},
  author = {Yinqi Hu and Yidian Li and Xian Du and Wenxuan Zhao and Kaiyi Zhai and Senyao Zhang and Jiawei Shao and Mingxin Mao and Houke Chen and Jieyi Liu and Donghui Lu and Makoto Hashimoto and Fangyuan Zhu and Zhengtai Liu and Dawei Shen and Yaobo Huang and Zhongkai Liu and D. Prabhakaran and Yanpeng Qi and Yilin Wang and Yulin Chen and Lexian Yang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.07656},
  eprint = {2610.07656},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.07656},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Luttinger Liquid Behavior in a Single-Layer Nickelate La1.4Sr0.6NiO4
AU  - Yinqi Hu
AU  - Yidian Li
AU  - Xian Du
AU  - Wenxuan Zhao
AU  - Kaiyi Zhai
AU  - Senyao Zhang
AU  - Jiawei Shao
AU  - Mingxin Mao
AU  - Houke Chen
AU  - Jieyi Liu
AU  - Donghui Lu
AU  - Makoto Hashimoto
AU  - Fangyuan Zhu
AU  - Zhengtai Liu
AU  - Dawei Shen
AU  - Yaobo Huang
AU  - Zhongkai Liu
AU  - D. Prabhakaran
AU  - Yanpeng Qi
AU  - Yilin Wang
AU  - Yulin Chen
AU  - Lexian Yang
PY  - 2026
DA  - 2026/10/06
PB  - arXiv
DO  - 10.48550/arxiv.2610.07656
UR  - https://arxiv.org/abs/2610.07656
AB  - The discovery of high-temperature superconductivity in bilayer and trilayer nickelates has spurred intense interest in the Ruddlesden-Popper nickelates; yet the fundamental properties of the NiO2 layer remain obscured by interlayer coupling. It is therefore imperative to investigate the electronic properties of their single-layer counterpart to isolate the intrinsic physics of the NiO layer. In this work, we present a systematic study of the single-layer nickelate La1.4Sr0.6NiO4 using high-resolution angle-resolved photoemission spectroscopy (ARPES) and theoretical calculations. We reveal strong electron correlation effects, manifested by high-energy kinks in band dispersions and a pronounced orbital-dependent band renormalization. Interestingly, we observe a quasi-one-dimensional electronic structure characterized by straight Fermi surface sheets along the diagonal momentum directions. Such square Fermi surface topology facilitates non-Fermi liquid behavior consistent with the Luttinger liquid model, as evidenced by the power-law spectral function, robust temperature scaling, and the observation of spin-charge separation. Our results therefore not only unveil an exotic Luttinger liquid behavior emerging from the unexpected dimensional reduction in an intrinsically quasi-two-dimensional nickelate but also provide a new perspective for understanding the intriguing physics in multilayer nickelates.
ER  -

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