Incommensurate spin-density wave in two-dimensional Hubbard model

TL;DR

This paper investigates the magnetic phase diagram of the 2D Hubbard model, revealing various incommensurate magnetic states and phase separation, with implications for understanding high-temperature superconductors.

Contribution

It provides a comprehensive analysis of incommensurate magnetic phases and phase separation in the 2D Hubbard model, including spiral and collinear states, which advances theoretical understanding of correlated electron systems.

Findings

Incommensurate magnetic phases are ground states at certain parameters.

Phase separation occurs among spiral magnetic states.

Results relate to properties of high-temperature superconductors.

Abstract

We consider the magnetic phase diagram of the two-dimensional Hubbard model on a square lattice. We take into account both spiral and collinear incommensurate magnetic states. The possibility of phase separation of spiral magnetic phases is taken into consideration as well. Our study shows that all the listed phases appear to be the ground state at certain parameters of the model. Relation of the obtained results to real materials, e.g. Cu-based high-temperature superconductors, is discussed.