Spectral weight of doping-induced states in the 2D Hubbard model

Abstract

The spectral weight of states induced in the Mott gap via hole doping in the two-dimensional Hubbard model is studied within cluster dynamical mean field theory combined with finite-temperature exact diagonalization. If the cutoff energy is chosen to lie just below the upper Hubbard band, the integrated weight per spin is shown to satisfy $W_{+}(\delta )\ge \delta$ ($\delta$ denotes the total number of holes), in agreement with model predictions by Eskes {\it et al.} [Phys. Rev. Lett. {\bf 67}, 1035 (1991)]. However, if the cutoff energy is chosen to lie in the range of the pseudogap, $W_{+}(\delta )$ remains much smaller than $\delta$ and approximately saturates near $\delta \approx \mathrm{0.2...0.3}$. The analysis of recent X-ray absorption spectroscopy data therefore depends crucially on the appropriate definition of the integration window.

4 pages 3 figures

References in corpus (3)

• Evolution of electronic structure of doped Mott insulators - reconstruction of poles and zeros of Green's function
• Measurement of x-ray absorption spectra of overdoped high-temperature cuprate superconductors: Inapplicability of the single-band Hubbard model
• Theory of oxygen K-edge x-ray absorption spectra of cuprates

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• Spectral function of the 2D Hubbard model: a density matrix renormalization group plus cluster perturbation theory study
• Failure of t-J models in describing doping evolution of spectral weight in x-ray scattering, optical and photoemission spectra of the cuprates
• Mottness Collapse and T-linear Resistivity in Cuprate Superconductors
• Doping evolution of Zhang-Rice singlet spectral weight: a comprehensive examination by x-ray absorption spectroscopy
• States induced in the single-particle spectrum by doping a Mott insulator
• Emergence of Quasiparticles in a Doped Mott Insulator
• X-ray absorption near-edge spectra of overdoped La_2-xSr_xCuO_4 high-T_c superconductors
• Two-Particle-Self-Consistent Approach for the Hubbard Model
• Spectral evolution with doping of an antiferromagnetic Mott state