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- W3155655378 abstract "We study the two-dimensional one-band Hubbard model on the square lattice through the spin rotation invariant Kotliar-Ruckenstein slave-boson method, with an emphasis on the electron-doped regime. The phase diagram determined within mean field approximation reveals three different magnetically ordered phases separated by first-order transitions, and a wide instability region as indicated by a negative compressibility. We show that this conundrum of the unstable mean field domain is resolved by spatially mixed phases of neighboring stable states. We also find charge density wave type instabilities in the antiferromagnetically ordered (AFM) state at wave vectors commensurate with the doping. The corresponding charge and spin density response functions are calculated from a Gaussian fluctuations formalism about a magnetic saddle point, for which we provide a detailed derivation. Further, we present density and spin excitation spectra in the AFM phase, allowing for a quantitative calculation of the spin wave parameters, the gap in the longitudinal spin excitation spectrum, and the density excitations in the upper Hubbard band." @default.
- W3155655378 created "2021-04-26" @default.
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- W3155655378 date "2021-04-16" @default.
- W3155655378 modified "2023-09-26" @default.
- W3155655378 title "Breakdown of charge homogeneity in the two-dimensional Hubbard model: Slave-boson study of magnetic order" @default.
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- W3155655378 doi "https://doi.org/10.1103/physrevb.103.165117" @default.
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