A link between the spin fluctuation and Fermi surface in high T_C cuprates --- A consistent description within the single-band Hubbard model

TL;DR

This paper demonstrates a theoretical link between spin fluctuations and Fermi surface evolution in high T_C cuprates using the single-band Hubbard model and FLEX approximation, aligning with experimental observations.

Contribution

It provides a consistent theoretical framework connecting spin fluctuation peaks and Fermi surface changes in cuprates, incorporating doping-dependent second nearest neighbor hopping.

Findings

Spin structure peak position matches experimental data.

Fermi surface evolution explained by doping-dependent hopping.

Incommensurability variation aligns with experiments.

Abstract

A link between the spin fluctuation and the "fermiology" is explored for the single-band Hubbard model within the fluctuation exchange (FLEX) approximation. We show that the experimentally observed peak position of the spin structure in the high T_C cuprates can be understood from the model that reproduces the experimentally observed Fermi surface. In particular, both the variation of the incommensurability of the peak in the spin structure and the evolution of the Fermi surface with hole doping in La_{2-x}Sr_xCuO_4 may be understood with a second nearest neighbor hopping decreasing with hole doping.