Quasiparticle states of the Hubbard model near the Fermi level

Abstract

The spectra of the t-U and t-t'-U Hubbard models are investigated in the one-loop approximation for different values of the electron filling. It is shown that the four-band structure which is inherent in the case of half-filling and low temperatures persists also for some excess or deficiency of electrons. Besides, with some departure from half-filling an additional narrow band of quasiparticle states arises near the Fermi level. The dispersion of the band, its bandwidth and the variation with filling are close to those of the spin-polaron band of the t-J model. For moderate doping spectral intensities in the new band and in one of the inner bands of the four-band structure decrease as the Fermi level is approached which leads to the appearance of a pseudogap in the spectrum.

arXiv comment8 pages, 7 figures

References in corpus (16)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Correlated Electrons in High Temperature Superconductors
• Quantum Cluster Theories
• Pseudogap induced by short-range spin correlations in a doped Mott insulator
• Hot Spots and Pseudogaps for Hole- and Electron-Doped High-Temperature Superconductors
• Quasiparticle Dispersion of the 2D Hubbard Model: From an Insulator to a Metal
• Anomalous low doping phase of the Hubbard model
• Strong-Coupling Perturbation Theory of the Hubbard Model
• The Hubbard model within the equations of motion approach
• Physics of cuprates with the two-band Hubbard model - The validity of the one-band Hubbard model
• Quasiparticle dispersion of the t-J and Hubbard models
• Two-dimensional t-J model at moderate doping
• One-loop approximation for the Hubbard model
• A generating functional approach to the Hubbard model
• Strong-coupling approach for strongly correlated electron systems
• Operator Projection Theory for Electron Differentiation in Underdoped Cuprate Superconductors

Cited by in corpus (10)

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• Magnetic susceptibility of the two-dimensional Hubbard model using a power series for the hopping constant
• The Mott transition in the strong coupling perturbation theory
• Equation of Motion Series Expansion of Double Time Green's Functions
• The Hubbard model in the strong coupling theory at arbitrary filling
• Continuum of many-particle states near the metal-insulator transition in the Hubbard model
• The Hubbard model in strong magnetic field: Low-frequency quantum oscillations due to strong electron correlations
• Spin and charge fluctuations in the Hubbard model
• Strongly correlated electron system in the magnetic field