Spectroscopic Evidence of Luttinger Liquid Behavior in a Single-Layer Nickelate

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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 NiO 2 layer remain obscured by interlayer coupling. It is therefore imperative to investigate the electronic properties of their single-layer counterpart—though not superconducting—to isolate the intrinsic physics of the Ni-O layer. In this work, we present a systematic study of the single-layer nickelate La 1.4 Sr 0.6 NiO 4 using high-resolution angle-resolved photoemission spectroscopy 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 a squarelike 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 spectroscopic features reminiscent of spin-charge separation. Our results therefore not only point toward an exotic Luttinger liquid phase 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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Funding Information
  • National Key Research and Development Program of China (2022YFA1403100)
  • National Key Research and Development Program of China (2022YFA1403201)
  • National Natural Science Foundation of China (12274251)
  • National Natural Science Foundation of China (12004270)
  • National Natural Science Foundation of China (52272265)
  • National Natural Science Foundation of China (12174365)
  • Tsinghua University
  • Science and Technology on Surface Physics and Chemistry Laboratory (XKFZ202102)
  • SLAC National Accelerator Laboratory
  • U.S. Department of Energy
  • Office of Science (DE-AC02-05CH11231)
  • Basic Energy Sciences (DE-AC02-76SF00515)
  • Advanced Light Source
  • Innovation Program for Quantum Science and Technology (2021ZD0302803)
  • New Cornerstone Science Foundation

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