Hubbard fermions band splitting at the strong intersite Coulomb interaction

TL;DR

This paper investigates how strong intersite Coulomb interactions in the t-V model lead to a split-off band of Fermi states, significantly altering the electron density of states and dependent on doping levels.

Contribution

It reveals a novel band splitting phenomenon caused by intersite Coulomb correlations, advancing understanding of electron structure in correlated systems.

Findings

Split-off band of Fermi states observed

Spectral intensity increases with doping

Electron density of states undergoes qualitative change

Abstract

The effect of the strong intersite Coulomb correlations on the formation of the electron structure of the t-V-model has been studied. A qualitatively new result has been obtained which consists in the occurrence of a split-off band of the Fermi states. The spectral intensity of this band increases with the enhancement of a doping level and is determined by the mean-square fluctuation of the occupation numbers. This leads to the qualitative change in the structure of the electron density of states.