Spin and charge modulations of a half-filled extended Hubbard model

Abstract

We introduce and analyze an extended Hubbard model, in which intersite Coulomb interaction as well as a staggered local potential (SLP) are considered, on the square lattice at half band filling, in the thermodynamic limit. Using both Hartree-Fock approximation and Kotliar and Ruckenstein slave boson formalism, we show that the model harbors charge order (CO) as well as joint spin and charge modulations (SCO) at finite values of the SLP, while the spin density wave (SDW) is stabilized for vanishing SLP, only. We determine their phase boundaries and the variations of the order parameters in dependence on the SLP, as well as on the on-site and nearest-neighbor interactions. Domains of coexistence of CO and SCO phases, suitable for resistive switching experiments, are unraveled. We show that the novel SCO systematically turns into the more conventional SDW phase when the zero-SLP limit is taken. We also discuss the nature of the different phase transitions, both at zero and finite temperature. In the former case, no continuous CO to SDW (or SCO) phase transition occurs. In contrast, a paramagnetic phase (PM), which is accompanied with continuous phase transitions towards both spin or charge ordered phases, sets in at finite temperature. A good quantitative agreement with numerical simulations is demonstrated, and a comparison between the two used approaches is performed.

17 pages, 7 figures, minor typos corrected

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Cited by in corpus (8)

• Multi-channel fluctuating field approach to competing instabilities in interacting electronic systems
• Interplay of spin and charge order in the electron-doped cuprates
• Extended Hubbard model describing small multi-dot arrays in bilayer graphene
• CDMFT+HFD : an extension of dynamical mean field theory for nonlocal interactions applied to the single band extended Hubbard model
• Exact functional integration of radial and complex slave-boson fields: thermodynamics and dynamics of the two-site extended Hubbard model
• Charge Collective Modes in Correlated Electron Systems: Plasmons Beyond the Random Phase Approximation
• Incommensurate magnetic order: A fingerprint for electronic correlations in hole-doped cuprates
• Phase coexistence in a half-filled extended Hubbard model