Charge-Density-Excitation Spectrum in the t-t'-J-V Model

Abstract

We study the density-density correlation function in a large-N scheme of the t-t'-J-V model. When the nearest-neighbor Coulomb interaction V is zero, our model exhibits phase separation in a wide doping region and we obtain large spectral weight near momentum q=(0,0) at low energy, which originates from the proximity to phase separation. These features are much stronger for electron doping than for hole doping. However, once phase separation is suppressed by including a finite V, the low-energy spectral weight around q=(0,0) is substantially suppressed. Instead a sharp zero-sound mode is stabilized above the particle-hole continuum. We discuss that the presence of a moderate value of V, which is frequently neglected in the t-J model, is important to understand low-energy charge excitations especially close to q=(0,0) for electron doping. This insight should be taken into account in a future study of x-ray scattering measurements.

arXiv comment12 pages, 3 figures

References in corpus (31)

• How to detect fluctuating order in the high-temperature superconductors
• Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x)
• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Magnetic-field-induced charge-stripe order in the high temperature superconductor YBa2Cu3Oy
• Ubiquitous Interplay between Charge Ordering and High-Temperature Superconductivity in Cuprates
• Charge order driven by Fermi-arc instability in Bi2201
• Resonant X-ray Scattering Study of Charge Density Wave Correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$
• Connection between charge-density-wave order and charge transport in the cuprate superconductors
• Distinct Charge Orders in the Planes and Chains of Ortho-III-Ordered YBa${}_2$Cu${}_3$O${}_{6+\delta }$ Superconductors Identified by Resonant Elastic X-ray Scattering
• X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa${}_2$Cu${}_3$O${}_{6.54}$
• Thermodynamic phase diagram of static charge order in underdoped YBCO
• Charge ordering in the electron-doped superconductor Nd2-xCexCuO4
• Asymmetry of collective excitations in electron and hole doped cuprate superconductors
• High-energy spin and charge excitations in electron-doped copper oxide superconductors
• Theory of electron-hole asymmetry in doped {\em CuO${}_2$} planes
• Phase separation in the Hubbard model
• Direct observation of bulk charge modulations in optimally-doped Bi${}_{1.5}$Pb${}_{0.6}$Sr${}_{1.54}$CaCu${}_2$O${}_{8+\delta }$
• Possible charge instabilities in two-dimensional doped Mott insulators
• Dynamical properties of a strongly correlated model for quarter-filled layered organic molecular crystals
• Theory of the density fluctuation spectrum of strongly correlated electrons
• Plasmon excitations in layered high-Tc cuprates
• Qualitative understanding of the sign of t' asymmetry in the extended t-J Model and relevance for pairing properties
• Large-N expansion based on the Hubbard operator path integral representation and its application to the t-J model II. The case for finite $J$
• Statics and dynamics of charge fluctuations in the t-J model
• Renormalization of the electron-phonon coupling in the one-band Hubbard model
• Large-N expansion based on the Hubbard-operator path integral representation and its application to the $t-J$ model
• On the electron-energy loss spectra and plasmon resonance in cuprates
• CPA for charge ordering in the extended Hubbard model
• Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering
• Strong particle-hole asymmetry of charge instabilities in doped Mott insulators
• $d$-wave bond-order charge excitations in electron-doped cuprates

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