Non-Fermi behavior of the disorder electronic system

TL;DR

This paper demonstrates that weakly disordered electronic systems within the Hubbard model can exhibit non-Fermi liquid behavior, characterized by a linear temperature dependence of the self-energy, aligning with experimental observations in cuprates.

Contribution

It introduces a theoretical analysis showing non-Fermi behavior in disordered Hubbard models, connecting it to experimental phenomena in high-temperature superconductors.

Findings

Self-energy's imaginary part shows linear temperature dependence.

Non-Fermi behavior observed at insulator-metal crossover.

Results align with experimental data in La_{2-x}Sr_xCuO_4.

Abstract

We showed that an electronic system with weak disorder considered in the finite-charge infinite U Hubbard model can present a non-Fermi behavior. The imaginary pert of the self-energy has been calculated and a linear temperature dependence was obtained. This result is in agreement with the non-Fermi behavior observed at the insulator-metal crossover in La_{2-x}Sr_xCuO_4.