Magnetic correlations around the Mott transition in the Kagom\'e lattice Hubbard model

TL;DR

This paper investigates magnetic correlations near the Mott transition in the Kagome lattice Hubbard model using advanced simulation techniques, revealing a shift in dominant spin fluctuations and a unique spatial spin configuration in the insulating phase.

Contribution

It introduces a detailed analysis of magnetic properties around the Mott transition in the Kagome lattice Hubbard model using cellular dynamical mean field theory and quantum Monte Carlo simulations.

Findings

Significant change in dominant spin fluctuations near the Mott transition.

In the insulating phase, strong antiferromagnetic correlations are confined to one chain direction.

Spatial spin configuration favors chain-specific antiferromagnetic correlations.

Abstract

We study the magnetic properties around the Mott transition in the Kagom\'e lattice Hubbard model by the cellular dynamical mean field theory combined with quantum Monte Carlo simulations. By investigating the q-dependence of the susceptibility, we find a dramatic change of the dominant spin fluctuations around the Mott transition. The spin fluctuations in the insulating phase favor down to the lowest temperature a spatial spin configuration in which antiferromagnetic correlations are strong only in one chain direction but almost vanishing in the others.