Metallic Néel order stabilized by coupling between inequivalent Hubbard layers
Yi-Ming Wu, Jessica Yiqi Pan, Hong Yao, Steven A. Kivelson
Abstract
Inspired by recent ARPES studies on multilayer (n≥3 layers) cuprate superconductors, we use the unrestricted Hartree-Fock approximation to explore the ground-state phase diagram of two coupled, inequivalently doped square-lattice Hubbard layers. In the decoupled-layer limit, the lightly hole-doped ground state is typically an incommensurate spin-stripe state. However, with sufficiently strong interlayer coupling, stripe order is destabilized relative to a commensurate Néel-ordered metal. The resulting state exhibits a reconstructed Fermi surface with hole pockets centered at (π/2,π/2) that are similar in character to those seen in experiments. Our results illustrate the qualitatively new physics that can arise from interlayer coupling in multilayer cuprates.
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