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TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: Poster
TT 80.35: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster E
Charge-Density wave in a two-band model of infinite-layer nickelates — •Tharathep Plienbumrung1, Maria Daghofer1, Jean-Baptiste Morée2, and Andrzej Oleś3 — 1Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Stuttgart, Germany — 2Waseda Research Institute for Science and Engineering, Waseda University, Tokyo, Japan — 3Institute for Theoretical Physics, Jangiellonian University, Krakow, Poland
Recent measurements on infinite-layer (IL) nickelate compounds have found a charge-ordered state in the undoped compound as well as, short-range magnetic behavior. These measurements highlight the significant role of the rare-earth orbitals on nickelate compound, and the importance of nonlocal correlations in studying IL nickelate. Here, we study the two-band model of IL nickelate, including intersite Coulomb interaction, at quarter-filling on cubic lattice. We employ variational cluster approach (VCA) to study the spin and charge properties of the model at thermodynamics limit. The short-range correlations within cluster size are solved exactly while the long-range interactions beyond the cluster are included via mean-field approximation. We show that the intersite Coulomb interactions are substantial, creating the interplay between the spin and charge fluctuations in the IL nickelate. Furthermore, we explore the effect of doping on the charge and magnetic properties of the model. The single-particle spectral functions of the model at different doping level will be presented.
Keywords: Nickelates; Charge-density wave; magnetism; Hubbard model