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

Source capture

Authors Yinqi Hu, Yidian Li, Xian Du, Wenxuan Zhao, Kaiyi Zhai, Senyao Zhang, Jiawei Shao, Mingxin Mao, Houke Chen, Jieyi Liu, Donghui Lu, Makoto Hashimoto, Fangyuan Zhu, Zhengtai Liu, Dawei Shen, Yaobo Huang, Zhongkai Liu, D. Prabhakaran, Yanpeng Qi, Yilin Wang, Yulin Chen, Lexian Yang

arXiv / Publisher https://arxiv.org/abs/2610.07656

PDF https://arxiv.org/pdf/2610.07656

Relevance score 5.616

Primary category cond-mat.supr-con

Published 2026-10-07

Research paradigm Not available in this batch.

Sample form Not available in this batch.

Summary

Using high-resolution angle-resolved photoemission spectroscopy combined with theoretical calculations, this work systematically investigates the single-layer Ruddlesden-Popper nickelate La_1.4Sr_0.6NiO₄ to isolate the intrinsic physics of the NiO layers. The results reveal strong electron correlations, manifested as high-energy kinks in the band dispersion and pronounced orbital-dependent band renormalization; flat Fermi surface sheets are also observed along the diagonal momentum direction, forming a quasi-one-dimensional electronic structure. This square Fermi surface topology gives rise to non-Fermi liquid behavior consistent with the Luttinger liquid model, as evidenced by power-law spectral functions, robust temperature scaling, and spin-charge separation. The study reveals exotic Luttinger liquid behavior emerging from an unexpected dimensional reduction in an intrinsic quasi-two-dimensional nickelate and provides a new perspective for understanding the physics of multilayer nickelates.