Theory of the density fluctuation spectrum of strongly correlated electrons

Abstract

The density response function $N(q,\omega )$ of the two-dimensional $t-J$ model is studied starting from a mixed gauge formulation of the slave boson approach. Our results for $N(q,\omega )$ are in remarkable agreement with exact diagonalization studies, and provide a natural explanation of the anomalous features in the density response in terms of the spin polaron nature of the charge carriers. In particular we have identified unexplained low energy structures in the diagonalization data as arising from the coherent polaron motion of holes in a spin liquid.

4 pages with 4 figures, to be published in Physical Review B (RC)

References in corpus (3)

• Evidence for Spin-Charge Separation in the Two-Dimensional T-J Model
• Anomalous Spin and Charge Dynamics of the 2D t-J Model at low doping
• Degenerate Bose liquid in a fluctuating gauge field

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• Interplay of Electron-Phonon Interaction and Electron Correlation in High Temperature Superconductivity
• Momentum Dependence of Charge Excitations in the Electron-Doped Superconductor Nd1.85Ce0.15CuO4: a RIXS Study
• Bosonic Spectral Function and The Electron-Phonon Interaction in HTSC Cuprates
• Apparent electron-phonon interaction in strongly correlated systems
• Large-N expansion based on the Hubbard operator path integral representation and its application to the t-J model II. The case for finite $J$
• Electron-phonon interaction in the three-band model
• On the electron-energy loss spectra and plasmon resonance in cuprates
• Charge dynamics and optical conductivity of the t-J model
• Compressibility of the Two-Dimensional infinite-U Hubbard Model
• Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering
• Doping dependence of density response and bond-stretching phonons in cuprates
• Phonon renormalization from local and transitive electron-lattice couplings in strongly correlated systems
• Electron Green's Function in the Planar t-J Model
• Itinerant and local-moment magnetism in strongly correlated electron systems
• Sum rules and vertex corrections for electron-phonon interactions
• Charge-Density-Excitation Spectrum in the t-t'-J-V Model
• Impact of electron correlations on two-particle charge response in electron- and hole-doped cuprates
• Charge susceptibility in the t-J model
• Interplay between charge-lattice interaction and strong electron correlations in cuprates: phonon anomaly and spectral kinks
• Propagating charge carrier plasmon in Sr2RuO4
• Charge order and phonon renormalizations: Possible implications for cobaltates
• Charge correlations and optical conductivity in weakly doped antiferromagnets
• Optical and acoustic plasmons in the layered material Sr${}_2$RuO${}_4$