Inversion symmetry breaking in bilayer multi-orbital Hubbard model with impurity approximation

Abstract

We investigated the Cu/Ni-O${}_2$ bilayer multi-orbital Hubbard model with Cu/Ni impurity approximation embedded in the O lattice by incorporating the 3d${}^8$ multiplet structure coupled to a full O-2p band. For this simplified model of describing the local electronic structure of hole doped homo-bilayer Cu(Ni)O${}_2$-Cu(Ni)O${}_2$ and hetero-bilayer CuO${}_2$-NiO${}_2$, we demonstrate that the homo-bilayer system hosts rich phase diagram with inversion symmetry breaking between two layers at strong enough interlayer hybridization, especially the coexistence of two-hole singlet and triplet states in opposite layers. Besides, we show that the interlayer hybridization in hetero-bilayer systems destabilizes the Zhang-Rice singlets or 3d${}^8$ triplets within each layer via charge transfer between layers. The relevance of these electronic redistribution to the bilayer or interface systems of cuprates and/or nickelates are discussed.

11 pages, 8 figures

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Cited by in corpus (1)

• Intertwined charge and spin instability of La${}_3$Ni${}_2$O${}_7$